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## Problem In https://github.com/neondatabase/neon/pull/12467, timeouts and retries were added to `Cache::get` tenant shard resolution to paper over an issue with read unavailability during shard splits. However, this retries _all_ errors, including irrecoverable errors like `NotFound`. This causes problems with gRPC child shard routing in #12702, which targets specific shards with `ShardSelector::Known` and relies on prompt `NotFound` errors to reroute requests to child shards. These retries introduce a 1s delay for all reads during child routing. The broader problem of read unavailability during shard splits is left as future work, see https://databricks.atlassian.net/browse/LKB-672. Touches #12702. Touches [LKB-191](https://databricks.atlassian.net/browse/LKB-191). ## Summary of changes * Change `TenantManager` to always return a concrete `GetActiveTimelineError`. * Only retry `WaitForActiveTimeout` errors. * Lots of code unindentation due to the simplified error handling. Out of caution, we do not gate the retries on `ShardSelector`, since this can trigger other races. Improvements here are left as future work.