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## Problem - `test_basebackup_cache` fails in https://github.com/neondatabase/neon/pull/11712 because after the timelines on safekeepers are managed by storage controller, they do contain proper start_lsn and the compute_ctl tool sends the first basebackup request with this LSN. - `Failed to prepare basebackup` log messages during timeline initialization, because the timeline is not yet in the global timeline map. - Relates to https://github.com/neondatabase/cloud/issues/29353 ## Summary of changes - Account for `timeline_onto_safekeepers` storcon's option in the test. - Do not trigger basebackup prepare during the timeline initialization.