Backport #7917, #7974 and #7975 to release-12.1 #8208
Draft
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cherry-pick the following at once for citus_stat_counters, not just the first commit:
3d61c4d
d2e6cf1
ea7aa67
This only backports binary changes and the tests for testing early on dev machines. For tests to work, also defines the user-facing UDFs for related test files.
DESCRIPTION: PR description that will go into the change log, up to 78 characters