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379259bdd7
Fixes [LKB-61](https://databricks.atlassian.net/browse/LKB-61): `test_timeline_archival_chaos` being flaky with storcon error `Requested tenant is missing`. When a tenant migration is ongoing, and the attach request has been sent to the new location, but the attach hasn't finished yet, it is possible for the pageserver to return a 412 precondition failed HTTP error on timeline deletion, because it is being sent to the new location already. That one we would previously log via sth like: ``` ERROR request{method=DELETE path=/v1/tenant/1f544a11c90d1afd7af9b26e48985a4e/timeline/32818fb3ebf07cb7f06805429d7dee38 request_id=c493c04b-7f33-46d2-8a65-aac8a5516055}: Error processing HTTP request: InternalServerError(Error deleting timeline 32 818fb3ebf07cb7f06805429d7dee38 on 1f544a11c90d1afd7af9b26e48985a4e on node 2 (localhost): pageserver API: Precondition failed: Requested tenant is missing ``` This patch changes that and makes us return a more reasonable resource unavailable error. Not sure how scalable this is with tenants with a large number of shards, but that's a different discussion (we'd probably need a limited amount of per-storcon retries). example [link](https://neon-github-public-dev.s3.amazonaws.com/reports/pr-12398/15981821532/index.html#/testresult/e7785dfb1238d92f).