Fix info colors used for hint diagnostics

[vonEdfa]

Super small update changing two instances where DiagnosticSeverity::HINT was set to use the color for "info".

Self-Review Checklist:

• I've reviewed my own diff for quality, security, and reliability
• Unsafe blocks (if any) have justifying comments
• The content is consistent with the UI/UX checklist
• Tests cover the new/changed behavior
• Performance impact has been considered and is acceptable

Closes #45637

Release Notes:

• Fixed various instances of hint level diagnostics using the color designated for info

[vonEdfa]

I left the test checkbox unchecked as I could not find any existing tests covering the lines changed and since this is my first contribution and I was unsure about the preferred practice for these instances. I also honestly wanted to keep the changes simple and small.

If you wish me to add tests for these lines let me know and I'll look into it. Otherwise we can check that box too. :)

[Veykril]

Thanks!