Removed unused import symbols from stdlib stubs and fixed a few other errors detected by pyright. I did a similar pass several months ago; these were introduced since then. (#4803)

Co-authored-by: Eric Traut <erictr@microsoft.com>

stdlib/3/distutils/command/upload.pyi

@@ -1,5 +1,5 @@
 from distutils.config import PyPIRCCommand
-from typing import ClassVar, List, Optional, Tuple
+from typing import ClassVar, List
 
 class upload(PyPIRCCommand):
     description: ClassVar[str]

stdlib/3/distutils/dist.pyi

@@ -1,9 +1,9 @@
 from _typeshed import AnyPath, SupportsWrite
 from distutils.cmd import Command
-from typing import IO, Any, AnyStr, Dict, Iterable, List, Mapping, Optional, Tuple, Type, Union
+from typing import IO, Any, Dict, Iterable, List, Mapping, Optional, Tuple, Type, Union
 
 class DistributionMetadata:
-    def __init__(self, path: Optional[Union[int, AnyPath]] = ...): ...
+    def __init__(self, path: Optional[Union[int, AnyPath]] = ...) -> None: ...
     name: Optional[str]
     version: Optional[str]
     author: Optional[str]