feat(pageserver): add automatic trigger for gc-compaction

[skyzh]

Problem

close #10031, part of #9114

Summary of changes

[github-actions]

7095 tests run: 6786 passed, 11 failed, 298 skipped (full report)

---

Failures on Postgres 17

• test_fully_custom_config: release-x86-64, release-x86-64, debug-x86-64, release-arm64, release-arm64

Failures on Postgres 16

• test_fully_custom_config: release-x86-64, release-arm64

Failures on Postgres 15

• test_fully_custom_config: release-x86-64, release-arm64

Failures on Postgres 14

• test_fully_custom_config: release-x86-64, release-arm64

# Run all failed tests locally:
scripts/pytest -vv -n $(nproc) -k "test_fully_custom_config[release-pg14] or test_fully_custom_config[release-pg14] or test_fully_custom_config[release-pg15] or test_fully_custom_config[release-pg15] or test_fully_custom_config[release-pg16] or test_fully_custom_config[release-pg16] or test_fully_custom_config[release-pg17] or test_fully_custom_config[release-pg17] or test_fully_custom_config[debug-pg17] or test_fully_custom_config[release-pg17] or test_fully_custom_config[release-pg17]"

Flaky tests (4)

Postgres 17

• test_timeline_archival_chaos: release-arm64, release-arm64

Postgres 16

• test_pageserver_gc_compaction_smoke: release-x86-64

Postgres 15

• test_pageserver_gc_compaction_smoke: release-x86-64

Test coverage report is not available

_{The comment gets automatically updated with the latest test results
5d99464 at 2024-12-20T23:36:26.682Z :recycle:}