Merge main into releases/v3

[github-actions]

Merging 797fb30 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)
• Revert "start-proxy: Skip proxy setup if no credentials are available" #2740 (@marcogario)
• Properly unset proxy env if empty #2741 (@marcogario)

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 11 out of 11 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/analyze-action.ts:208

• This newly introduced code path for unsetting environment variables should be verified by tests to ensure correct behavior and avoid regressions. Please add or update tests covering the scenario where CODEQL_PROXY_HOST is empty.

if (process.env.CODEQL_PROXY_HOST === "") {

src/start-proxy-action.ts:103

• This early return for no credentials found should be included in test coverage to confirm the skipping of proxy setup does not introduce unexpected behavior. Please add or expand tests for this scenario.

if (credentials.length === 0) {

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