[CI] Use Ubuntu 24.04 image, more code coverage, disable CodeQL completely

[gwynne]

• When running Swift 5.10 images, use the Ubuntu 24.04 "Noble Numbat" image.
• Upload code coverage for all Linux test runs, not just 5.10's; Codecov intelligently merges results. This makes coverage numbers more accurate.
• Comment out the CodeQL job altogether rather than just skipping it so it doesn't clutter the Github UI.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 55.07%. Comparing base (5c26876) to head (8e6e44a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #482 +/- ## ========================================== - Coverage 60.12% 55.07% -5.06% ========================================== Files 125 127 +2 Lines 9172 10155 +983 ========================================== + Hits 5515 5593 +78 - Misses 3657 4562 +905 ``` [see 5 files with indirect coverage changes](https://app.codecov.io/gh/vapor/postgres-nio/pull/482/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vapor)