CI Fixes, TSAN Fix

[Mytherin]

Various CI fixes:

• Turn on informational for the codecov project CI, which should (hopefully) prevent it from failing
• Move regression test to a separate workflow and add a slightly increased threshold to guard against false positives
• Restore OSX Debug workflow, it had been accidentally erased
• Fix TSAN issue that was triggered with the pending query executor by turning the query profiler into a shared pointer and also moving the ownership of the query profiler into the executor. This fixes a potential issue that might happen with the profiler if a query was cancelled while background threads were processing the query.