Merge main into releases/v3

[github-actions]

Merging 54b1c84 into releases/v3.

Conductor for this PR is @marcogario.

Contains the following pull requests:

• start-proxy: Skip proxy setup if no credentials are available #2724 (@marcogario)
• start-proxy: Remove unusued proxy_password input #2733 (@marcogario)
• Mergeback v3.28.6 refs/heads/releases/v3 into main #2736 (@aeisenberg)

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.

[Copilot]

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

start-proxy/action.yml:10

• The removal of the proxy_password input is a user-facing change that is not documented. If you intend to remove it, please update the changelog accordingly; otherwise, restore the input.

  proxy_password:

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[Copilot]

Removing the proxy_password input is a user-facing change, so this line is misleading. Please update the changelog to reflect the removal of the proxy_password input or revert its removal if it was unintentional.

Suggested change

	No user facing changes.
	- Removed the `proxy_password` input. [#XXXX](https://github.com/github/codeql-action/pull/XXXX)