[python] Cleanup supported/unsupported versions xmls

- Drop support for python 3.5 & 3.6 in compatibility inspection
- Fix and remove some outdated tests
- Remove xmls for long-unsupported python 2.6 & 3.5
- Regenerate versions.xml
- Remove mentions of OS-specific modules

GitOrigin-RevId: 3265dd1de8a4f7a41119e10c95bb705ca5845efe

python/testData/quickFixes/PyAddFromFutureImportAnnotationsQuickFixTest/notSuggestedOnBitwiseOrUnionInIsInstance.py

@@ -1,4 +1,4 @@
 class A:
     pass
 
-assert isinstance(A(), <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)
+assert isinstance(A(), <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyAddFromFutureImportAnnotationsQuickFixTest/notSuggestedOnBitwiseOrUnionInIsSubclass.py

@@ -1,4 +1,4 @@
 class A:
     pass
 
-assert issubclass(A, <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)
+assert issubclass(A, <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyAddFromFutureImportAnnotationsQuickFixTest/suggestedOnBitwiseOrUnionInReturnAnnotation.py

@@ -1,5 +1,5 @@
 from typing import Union
 
 
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | Union[str, bool]</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | Union[str, bool]</warning>:
     return 42

python/testData/quickFixes/PyAddFromFutureImportAnnotationsQuickFixTest/suggestedOnBitwiseOrUnionInVariableAnnotation.py

@@ -1,4 +1,4 @@
 from typing import Union
 
 
-a<warning descr="Python versions 2.7, 3.5 do not support variable annotations">: <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | Union[str, bool]</warning></warning> = 42
+a<warning descr="Python version 2.7 does not support variable annotations">: <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | Union[str, bool]</warning></warning> = 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsInstance.py

@@ -1,4 +1,4 @@
 class A:
     pass
 
-assert isinstance(A(), <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)
+assert isinstance(A(), <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsSubclass.py

@@ -1,4 +1,4 @@
 class A:
     pass
 
-assert issubclass(A, <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)
+assert issubclass(A, <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturn.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturnComplexType.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | list[dict[int, str]] | set[list[int]] | dict[str, int]</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | list[dict[int, str]] | set[list[int]] | dict[str, int]</warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneStrWithUnion.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | None | str</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | None | str</warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneWithOptional.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">int<caret> | None</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">int<caret> | None</warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntStrNoneWithUnion.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | None</warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | None</warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxNoneIntWithOptional.py

@@ -1,2 +1,2 @@
-def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">None | int<caret></warning>:
+def foo() -> <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">None | int<caret></warning>:
     return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxParenthesizedUnions.py

@@ -1,4 +1,4 @@
 class A:
     pass
 
-assert isinstance(A(), <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">(int<caret> | str | (list[str] | bool | float)) | dict[str, int]</warning>)
+assert isinstance(A(), <warning descr="Python versions 2.7, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">(int<caret> | str | (list[str] | bool | float)) | dict[str, int]</warning>)