test_location_conf_churn fails with "could not read block" error on attempt to download deleted layer

[alexanderlaw (reporter)]: @jcsp , thank you for the fix! (I run this test on my Linux laptop, and I guess the failure could be timing-dependent, so may be for reproducing it, the test duration should be approximately the same as shown above.) Yeah, I'll start testing it now (I'd test it for several hours to be sure).

Context: GitHub issue neondatabase/neon#11348 (closed, 28 comments): Several failures of the testlocationconfchurn test: https://neon-github-public-dev.s3.amazonaws.com/reports/pr-10537/13725294150/index.html#testresult/9985f1fcf2c1267a testlocationconfchurn[debug-pg17-2] / X64 / _lfc: 'without-lfc' / seed: 2 https://neon-github-public-dev.s3.amazonaws.com/reports/pr-10841/13440141402/index.html#testresult/3f38c46eb2f7cc testlocationconfchurn[release-pg17-2] / ARM64 / _lfc: 'without-lfc' / seed: 2 with the following diagnostics: ``` testrunner/regress/testpageserversecondary.py:245: in testlocationconfchurn workload.churnrows( test_runner/fixt

GitHub issue neondatabase/neon#11348 (closed, 28 comments): Several failures of the testlocationconfchurn test: https://neon-github-public-dev.s3.amazonaws.com/reports/pr-10537/13725294150/index.html#testresult/9985f1fcf2c1267a testlocationconfchurn[debug-pg17-2] / X64 / _lfc: 'without-lfc' / seed: 2 https://neon-github-public-dev.s3.amazonaws.com/reports/pr-10841/13440141402/index.html#testresult/3f38c46eb2f7cc testlocationconfchurn[release-pg17-2] / ARM64 / _lfc: 'without-lfc' / seed: 2 with the following diagnostics: ``` testrunner/regress/testpageserversecondary.py:245: in testlocationconfchurn workload.churnrows( test_runner/fixt Verified answer: [alexanderlaw (reporter)]: @jcsp , thank you for the fix! (I run this test on my Linux laptop, and I guess the failure could be timing-dependent, so may be for reproducing it, the test duration should be approximately the same as shown above.) Yeah, I'll start testing it now (I'd test it for several hours to be sure). Source: https://github.com/neondatabase/neon/issues/11348