Merge main into releases/v3

[github-actions]

Merging 5bf6dad into releases/v3.

Conductor for this PR is @smowton.

Contains the following pull requests:

• Update default bundle to 2.17.5 #2327 (@smowton)
• Fix incompatibility between direct tracing in the autobuild Action and specifying a custom working directory #2328 (@henrymercer)
• Add rollback mechanism for C# buildless #2329 (@henrymercer)
• Mergeback v3.25.9 refs/heads/releases/v3 into main #2335 (@henrymercer)

Please do the following:

• Ensure the CHANGELOG displays the correct version and date.
• Ensure the CHANGELOG includes all relevant, user-facing changes since the last release.
• Check that there are not any unexpected commits being merged into the releases/v3 branch.
• Ensure the docs team is aware of any documentation changes that need to be released.
• Mark the PR as ready for review to trigger the full set of PR checks.
• Approve and merge this PR. Make sure Create a merge commit is selected rather than Squash and merge or Rebase and merge.
• Merge the mergeback PR that will automatically be created once this PR is merged.
• Merge all backport PRs to older release branches, that will automatically be created once this PR is merged.