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## Problem As https://github.com/neondatabase/neon/issues/6092 points out, this test was (ab)using a failpoint!() with 'pause', which was occasionally causing index uploads to get hung on a stuck executor thread, resulting in timeouts waiting for remote_consistent_lsn. That is one of several failure modes, but by far the most frequent. ## Summary of changes - Replace the failpoint! with a `sleep_millis_async`, which is not only async but also supports clean shutdown. - Improve debugging: log the consistent LSN when scheduling an index upload - Tidy: remove an unnecessary checkpoint in the test code, where last_flush_lsn_upload had just been called (this does a checkpoint internally)