SCons: Add unobtrusive type hints in SCons files

[Repiteo]

• Supersedes SCons: Integrate intellisense hinting for SConstruct/SCsub files #86213
• Supersedes SCons: ruff SConstruct/SCsub fixes #92264

This PR adds scons_hints.py to the repo, which grants intellisense logic to all SCons files. Like #86213, this doesn't change any of the script files themselves outside of the include statement; however, the actual line is even more compact & setup to play nice with our new ruff formatter. Now all SCons files will have this header:

#!/usr/bin/env python
from misc.utility.scons_hints import *

No space after the shebang is deliberate, as this new line is effectively metadata. The comments at the end are to disable a warning for a star import (not added to pyproject.toml, as this should be warned about for all other cases) & to not account for this line when performing isort (EDIT: Removed comments; logic handled entirely by pyproject.toml). Opted to put the hint file in misc/utility to avoid cluttering the root, and the added verbosity helps the line feel more "no-touchy".

The only other changes were making isort automatically put the metadata import on top & adjusting the per-file-ignores for SCons files:

• F821 (Undefined name) was removed, as now all the names are properly defined.
• F403 (Import star) was added, as this setup relies on the import star syntax.
• F405 (Import star variable) was added, same as above.

[Repiteo]

Made a slight adjustment to no longer need the # noqa: F403 # isort: skip comment. Turns out that tool.ruff.lint.isort has options to define import order, so I made a dedicated metadata section which includes misc.scripts.scons_hints exclusively. Now tools don't have to worry about out-of-order sorts from automated IDE actions, as isort will ensure the metadata section is always on top. Additionally, F403 was added to the per-file ignores alongside F405, as it's the only instance of star importing in the entire repo & is isolated to SCons as-is.

[Repiteo]

With the belated due-date of 4.3 & largely indirect nature of this implementation, this felt like a safe milestone adjustment. Feel free to revert if this feels out-of-scope.