Retry a merge that failed while applying

For a failed merge whose failed_phase is roles, enum_add, tx or online. Failed in online: the plan's transaction is committed and the target changed; only the online steps (concurrent indexes, constraint validation) are left, and the worker continues where it stopped (a valid index is skipped, an invalid one is dropped and rebuilt); the merge is online again. If the plan's transaction is no longer on the target, or the target is gone, the merge fails for good. Failed before (roles, enum_add, tx): the worker first checks whether the plan's transaction committed after all (its answer may have been lost); if it did, it goes on to the online steps; if not, the apply runs again from the start, with its checks (a target that changed since the merge was computed makes it stale; roles and enum values the first attempt made stay); the merge is applying again.

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