Rollout 2025-05-09 / 20250509.3

https://dev.azure.com/dnceng/internal/_build/results?buildId=2705630

What's Changed

• [automated] Merge branch 'production' => 'main' by @github-actions in #4819
• Fix auto-resolution of forward flow conflicts by @premun in #4821
• Remove mapping/repo name check from Backflow merge policy by @dkurepa in #4820
• [Rollout] Production Rollout 2025 05 09 by @dkurepa in #4824

Full Changelog: v20250507.6-1.1.0-beta.25257.6...v20250509.3-1.1.0-beta.25259.3