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22c26d610b
Switched the order; doing https://github.com/neondatabase/neon/pull/6139 first then can remove uninit marker after. ## Problem Previously, existence of a timeline directory was treated as evidence of the timeline's logical existence. That is no longer the case since we treat remote storage as the source of truth on each startup: we can therefore do without this mark file. The mark file had also been used as a pseudo-lock to guard against concurrent creations of the same TimelineId -- now that persistence is no longer required, this is a bit unwieldy. In #6139 the `Tenant::timelines_creating` was added to protect against concurrent creations on the same TimelineId, making the uninit mark file entirely redundant. ## Summary of changes - Code that writes & reads mark file is removed - Some nearby `pub` definitions are amended to `pub(crate)` - `test_duplicate_creation` is added to demonstrate that mutual exclusion of creations still works.