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## Problem While investigating problem with test_subscriber_restart flukyness, I found out that this test is not passed at all for PG 14/15 at MacOS (while working for PG16). ## Summary of changes Rewrite async connect state machine exactly in the same way as in Vanilla: call `WaitLatchOrSocket` with `WL_SOCKETR_WRTEABLE` before calling `PQconnectPoll`. Please notice that most likely it will not fix flukyness of test_subscriber_restart. ## Checklist before requesting a review - [ ] I have performed a self-review of my code. - [ ] If it is a core feature, I have added thorough tests. - [ ] Do we need to implement analytics? if so did you add the relevant metrics to the dashboard? - [ ] If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section. ## Checklist before merging - [ ] Do not forget to reformat commit message to not include the above checklist Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>