`reportShadowedImports` doesn't report diagnostics for files that are overriding a `stdlib` module

[StellaHuang95]

Environment data

• Language Server version: 2024.6.1
• OS and version: XXX
• Python version (& distribution if applicable, e.g. Anaconda): XXX

Repro Steps

1. Create a workspace in VSCode
2. Set the "reportShadowedImports": "error" in settings.json
3. Create 2 python files sys.py and mailbox.py

Expected behavior

I am expecting to see 2 diagnostics:

"xxx\folder1\mailbox.py" is overriding the stdlib module "mailbox" and "xxx\folder1\sys.py" is overriding the stdlib module "sys"

Actual behavior

Only getting 1 diagnostic:

"xxx\folder1\mailbox.py" is overriding the stdlib module "mailbox"

Only repros with certain stdlib modules such as os, json, sys