Addressed minor errors caught by pyright in stdlib stubs (#4880)

* 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.

* Added a few missing types and type arguments. Removed unused import statement. Removed default values that caused overloads to have overlapping signatures.

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

stdlib/3/distutils/command/upload.pyi

@@ -5,4 +5,4 @@ class upload(PyPIRCCommand):
     description: ClassVar[str]
     boolean_options: ClassVar[List[str]]
     def run(self) -> None: ...
-    def upload_file(self, command, pyversion, filename) -> None: ...
+    def upload_file(self, command: str, pyversion: str, filename: str) -> None: ...