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6dec85b19d
Previously, the /v1/tenant/:tenant_id/timeline/:timeline_id/do_gc API call performed a flush and compaction on the timeline before GC. Change it not to do that, and change all the tests that used that API to perform compaction explicitly. The compaction happens at a slightly different point now. Previously, the code performed the `refresh_gc_info_internal` step first, and only then did compaction on all the timelines. I don't think that was what was originally intended here. Presumably the idea with compaction was to make some old layer files available for GC. But if we're going to flush the current in-memory layer to disk, surely you would want to include the newly-written layer in the compaction too. I guess this didn't make any difference to the tests in practice, but in any case, the tests now perform the flush and compaction before any of the GC steps. Some of the tests might not need the compaction at all, but I didn't try hard to determine which ones might need it. I left it out from a few tests that intentionally tested calling do_gc with an invalid tenant or timeline ID, though.