merge queue: embarking unstable (521be2b) and [#8065 + #7751 + #7924] together

[mergify]

❌ This pull request has failed checks. #7924 will be removed from the queue. ❌

Branch unstable (521be2b), #8065, #7751 and #7924 are embarked together for merge.

This pull request has been created by Mergify to speculatively check the mergeability of #7924.
You don't need to do anything. Mergify will close this pull request automatically when it is complete.

Required conditions of queue default for merge:

• check-success=test-suite-success
• check-success=local-testnet-success

Required conditions to stay in the queue:

• #approved-reviews-by >= 1
  • Use scoped rayon pool for backfill chain segment processing #7924
• check-success=license/cla
  • Use scoped rayon pool for backfill chain segment processing #7924
• check-success=target-branch-check
  • Use scoped rayon pool for backfill chain segment processing #7924
• label!=do-not-merge
  • Use scoped rayon pool for backfill chain segment processing #7924

---
checking_base_sha: 521be2b7576e94a0ca01107cc08d0b3a35a96dee
previous_failed_batches: []
pull_requests:
  - number: 7924
...

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
3 out of 4 committers have signed the CLA.

✅ michaelsproul
✅ eserilev
✅ jimmygchen
❌ mergify[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
3 out of 4 committers have signed the CLA.

✅ michaelsproul
✅ jimmygchen
✅ eserilev
❌ mergify[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}