Fixes #20927.

The error message raised when type arguments are applied to a non-class expression (e.g. a generic function):

error: Type application is only supported for generic classes

is inaccurate because PEP 695 type aliases (type TA[T] = list[T]) also support type application (TA[int]). Updated to:

error: Type application is only supported for generic classes and type aliases

Updated mypy/message_registry.py (ONLY_CLASS_APPLICATION) and all matching test fixtures.

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