PY-44026 Always match the first component of a qualified name in suggestions

For instance, "numpy.foo" should not match "pkg.test_numpy.foo".

GitOrigin-RevId: b3f3dfb17b0705eb3f93368eb281ba662ea92e3c

python/testData/completion/notImportedQualifiedName/QualifiedNamesAlwaysMatchedByFirstComponentOfQualifier/bar.py

@@ -0,0 +1,2 @@
+def func():
+    pass

python/testData/completion/notImportedQualifiedName/QualifiedNamesAlwaysMatchedByFirstComponentOfQualifier/baz/quux.py

@@ -0,0 +1,2 @@
+def func():
+    pass

python/testData/completion/notImportedQualifiedName/QualifiedNamesAlwaysMatchedByFirstComponentOfQualifier/foo/bar.py

@@ -0,0 +1,2 @@
+def func():
+    pass

python/testData/completion/notImportedQualifiedName/QualifiedNamesAlwaysMatchedByFirstComponentOfQualifier/main.py

@@ -0,0 +1 @@
+ba.fu<caret>