CI: Refine mypy integration

[Repiteo]

Depends on: #93058

Updates mypy from 0.971 to 1.10.0, the latest version at time of writing. With this comes a few changes:

• pyproject.toml mypy section is now sorted alphabetically, excluding the last two rules.
• Added scripts_are_modules, which is already passed in the pre-commit & properly applies the aforementioned exclusion.
• Added tokenize-rt dependency to hook as recommended by the repo's readme.
• Added python_version, set to the lowest possible value supported (3.8).
• Fixed three warnings in files caused by making typed declarations in untyped definitions.

[Repiteo]

Converting to draft now that #92264 is superseded; will repurpose to not exclude SCons files

[Repiteo]

Now explicitly depends on #93058, as that takes care of the Scons file errors; keeping as a draft until it's merged