Add Swift version info to CI output

[gwynne]

• Adds OS platform and arch (e.g. ubuntu22.04-aarch64), Swift tag (e.g. swift-DEVELOPMENT-SNAPSHOT-2023-05-09-a or swift-5.8-RELEASE), and Swift version (e.g. Swift version 5.8 (swift-5.8-RELEASE)\nTarget: aarch64-unknown-linux-gnu) to the visible output of CI test runs.
• As a side effect, restores correct reporting of platform and version data to code coverage uploads for nightlies.
• Set the default LOG_LEVEL to info instead of debug across the board (improves overall CI speed noticeably)
• Switch macOS CI to Ventura runner
• Add some missing quoting in CI

[codecov-commenter]

Codecov Report

Merging #369 (99a4a95) into main (2bfdd55) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #369 +/- ## ======================================= Coverage 42.98% 42.98% ======================================= Files 118 118 Lines 8243 8243 ======================================= Hits 3543 3543 Misses 4700 4700 ```