PG-343: Enable TAP testing; PG-292: Automate the QA; PG-338: Calls count.; PG-331: Default values in PMM.

This commit brings following changes to this branch:
1) Port changes/additions TAP testing from main branch to this branch, under PG-292.
2) Changes to test cases due to GUCs change, under PG-331.
3) Call counts verfications, under PG-338.
4) Changes to github workflows to accomodate automation for TAP testing, under PG-343.

regression/sql/counters.sql

@@ -1,4 +1,5 @@
 CREATE EXTENSION pg_stat_monitor;
+Set pg_stat_monitor.pgsm_track='all';
 SELECT pg_stat_monitor_reset();
 
 CREATE TABLE t1 (a INTEGER);