Mega sync performance improvements (#13746)

* Add a Postgres test [ci postgres]

* Mega-optimized SELECT probe query [ci drivers]

* Mega sync improvements [ci drivers]

* Even more amazing sync perf improvements [ci drivers]

* Fix bad edit [ci drivers]

* Test/lint fixes 

* Test fix  [ci drivers]

* Some driver fixes  [ci drivers]

* Address PR feedback [ci drivers]

* Test fixes for everything except for Oracle [ci drivers]

* Fix Oracle [ci drivers]

* Fix Redshift [ci redshift]