test(pageserver): add detach ancestor smoke test

[skyzh]

Problem

Follow up to #9682, hopefully we can detect some issues or assure ourselves that this is ready for production.

Summary of changes

• Add a compaction-detach-ancestor smoke test.

[github-actions]

5544 tests run: 5326 passed, 0 failed, 218 skipped (full report)

---

Flaky tests (2)

Postgres 17

• test_replica_query_race: release-x86-64

Postgres 14

• test_compute_pageserver_connection_stress: release-x86-64

Code coverage* (full report)

• functions: 31.4% (7960 of 25347 functions)
• lines: 49.3% (63133 of 128094 lines)

* collected from Rust tests only

---

_{The comment gets automatically updated with the latest test results
60dec2c at 2024-11-22T18:20:33.819Z :recycle:}

[skyzh]

tests seem to work, waiting for the bot to update the message