Create subconversations on first commit#3355
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This PR changes the way subconversations are created to be consistent with the approach used for MLS 1-1 conversations. Namely, instead of the GET endpoint creating the conversation when it doesn't exist, creation happens within the commit lock of the first commit.
This also fixes a latent race condition where one thread could "create" an existing conversation which had already progressed to epoch 1, thereby resetting its epoch to 0 and breaking it.
https://wearezeta.atlassian.net/browse/WPB-1927
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changelog.d