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130184fee9
Out of scope LSNs include pre initdb LSNs, and LSNs prior to latest_gc_cutoff. To get there there was also two cleanups: * Fix error handling in Execute message handler. This fixes behaviour when basebackup retured an error. Previously pageserver thread just died. * Remove "ancestor" file which previously contained ancestor id and branch lsn. Currently the same data can be obtained from metadata file. And just the way we handled ancestor file in the code introduced the case when branching fails timeline directory is created but there is no data in it except ancestor file. And this confused gc because it scans directories. So it is better to just remove ancestor file and clean up this timeline directory creation so it happens after all validity checks have passed