PG-377: Enable PPG Jobs for PGSM in GH.

This commit contains following,
1) Regression jobs are enabled against Percona PG distribution for version postgresql 11~14.
2) Regression job is enabled against PGDG PG distribution for version postgresql 14.
3) GH actions names for some of the jobs are changed to clear the clutter in GH repo's action page.

.github/workflows/postgresql-13-build.yml

@@ -3,7 +3,7 @@ on: [push]
 
 jobs:
   build:
-    name: postgresql-13-build
+    name: pg-13-build-test
     runs-on: ubuntu-latest
     steps:
       - name: Clone postgres repository
@@ -134,4 +134,4 @@ jobs:
             **/regression.diffs
             **/regression.out
             src/pg_stat_monitor/logfile
-          retention-days: 1
+          retention-days: 3