gh-101503: Exclude renamed argparse._SubParsersAction.add_parser HTML id

Renaming _SubParsersAction to the public SubParsersAction changes the
Sphinx-generated anchor for its add_parser method, which the
check-html-ids CI job flags as a broken external link. Declare the
old anchor as an intentionally removed id, per the check's own
instructions.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: NAVEENKUMARKR777

Doc/tools/removed-ids.txt

@@ -24,6 +24,7 @@ using/configure.html: cmdoption-with-system-libmpdec
 # Removed APIs
 library/symtable.html: symtable.Class.get_methods
 library/sys.html: sys._enablelegacywindowsfsencoding
+library/argparse.html: argparse._SubParsersAction.add_parser
 c-api/import.html: c.PyImport_LazyImportsMode.PyImport_LAZY_NONE
 c-api/frame.html: c.PyUnstable_EXECUTABLE_KINDS
 c-api/frame.html: c.PyUnstable_ExecutableKinds