tests: tolerate pageserver 500s in test_timeline_archival_chaos

[jcsp]

Problem

Test exposes cases where pageserver gives 500 responses, causing failures like https://neon-github-public-dev.s3.amazonaws.com/reports/pr-9766/11844529470/index.html#suites/d1acc79950edeb0563fc86236c620898/3546be2ffed99ba6

Summary of changes

• Tolerate such messages, and link an issue for cleaning up the pageserver not to return such 500s.

[github-actions]

5418 tests run: 5175 passed, 0 failed, 243 skipped (full report)

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Flaky tests (2)

Postgres 16

• test_wal_restore: release-arm64
• test_wal_restore_initdb: release-arm64

Code coverage* (full report)

• functions: 31.8% (7889 of 24841 functions)
• lines: 49.4% (62447 of 126383 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
c209e10 at 2024-11-15T13:21:51.407Z :recycle:}