IDEA-CR-49176: fixes after review of function inline for python

- codestyle improvements
- reuse TypeEvalContext and PyResolveContext
- check PyDunderAllReference specifically to avoid unwanted side effects
- skip resolving PyTargetExpression
- replace references with import alias in the refactoring, instead of the utility method
- added single reference search for PyStringLiteralExpressionImpl
- cleanup obsolete tests

GitOrigin-RevId: 3e33c880a8fe116a5b98583059c83b7dd67e34a2

python/testData/refactoring/inlineFunction/functionFromBinaryStub.py

@@ -0,0 +1,3 @@
+from sys import exit
+
+ex<caret>it()