Output distinct types when type names are ambiguous #15183
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Fixes #12677
When assert_type fails, when the type of value examined and the specified type have the same name, mypy returns an error with more descriptive and distinct names.
Example:
Error: Expression is of type "mypy-test.SupportsIndex", not "typing_extensions.SupportsIndex"
instead of
Error: Expression is of type "SupportsIndex", not "SupportsIndex" (previous behavior)
Testing:
Added unit tests in test-data/unit/check-assert-type-fail.test.