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## Problem If a tenant is cancelled (e.g. due to Pageserver shutdown) during attach, it is set to `Broken`. This results both in error log spam and 500 responses for clients -- shutdown is supposed to return 503 responses which can be retried. This becomes more likely to happen with #11328, where we perform tenant manifest downloads/uploads during attach. ## Summary of changes Set tenant state to `Stopping` when attach fails and the tenant is cancelled, downgrading the log messages to INFO. This introduces two variants of `Stopping` -- with and without a caller barrier -- where the latter is used to signal attach cancellation.