Merge pull request github#1761 from github/henrymercer/remove-fetchin…

…g-releases-fallback

Simplify CodeQL setup now that the last two releases have semver bundles

Send new per-query alert count event reports for QA telemetry (github…

…#1741)

PR checks: stop setting experimental Swift var for new CLI versions (g…

…ithub#1718)

Now that `latest` and `cached` are both 2.13.3, which is the version in which we GA'ed Swift, we should stop setting this experimental variable when we test these CLI versions so we can test the case where the variable is unset.