fix(pagesever): stablize gc-compaction tests #10621
Draft
+3
−0
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Problem
Hopefully this can resolve #10517. The reason why the test is flaky is that after restart the compute node might write some data so that the pageserver flush some layers, and in the end, causing L0 compaction to run, and we cannot get the test scenario as we want.
Summary of changes
Ensure all L0 layers are compacted before starting the test.