Chore: Update clang-format rules (clang-format-19)

[zach2good]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Of note/TODO:

• Death to all clang-format on/off blocks
• We now live in a west const world
• I'm still fighting with macros
• I'm still fighting with things like settings::overloaded
• I'm still fighting with conditional reflowing, etc.
• I'm still fighting with type and assignment alignment
• I decided to keep namespace nesting
• Spaces around simple {} etc.
• Make it easy to setup the tooling for Windows/Linux/OSX, have it work easily/automatically in VSCode
• Make it hard to use the wrong versions of clang-format, etc.
• Update CI

[zach2good]

#6423