fix(server): wake PR watches when no checks report#23863

test(server): cover checks arriving after no-checks notice

fix(server): keep the no-checks wait constant module-private

Merge origin/main into fix/issue-23701

fix(server): only GitHub watches report a head with no checks

fix(server): a watched pull request with no checks wakes the thread once

test(server): reproduces issue 23701, a watch on a head with no checks never wakes