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## Problem The initdb cancellation added in #5921 is not sufficient to reliably abort the entire initdb process. Initdb also spawns children. The tests added by #6310 (#6385) and #6436 now do initdb cancellations on a more regular basis. In #6385, I attempted to issue `killpg` (after giving it a new process group ID) to kill not just the initdb but all its spawned subprocesses, but this didn't work. Initdb doesn't take *that* long in the end either, so we just wait until it concludes. ## Summary of changes * revert initdb cancellation support added in #5921 * still return `Err(Cancelled)` upon cancellation, but this is just to not have to remove the cancellation infrastructure * fixes to the `test_tenant_delete_races_timeline_creation` test to make it reliably pass Fixes #6385