Add CI check for unecessary template tests

[fabriziomello]

When the regression tests output differs between PG versions we create a template test (aka *.sql.in) and add several different output files for each supported version.

Over time we support new PG version and deprecate older ones, for example nowadays we're working on PG16 support and removed PG12 so we need to check if we still need template files.

Disable-check: force-changelog-file

[github-actions]

@akuzm, @antekresic: please review this pull request.

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[codecov]

Codecov Report

Merging #6191 (26d5c48) into main (5752c33) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6191      +/-   ##
==========================================
- Coverage   81.46%   81.40%   -0.07%     
==========================================
  Files         246      246              
  Lines       56954    56908      -46     
  Branches    12619    12600      -19     
==========================================
- Hits        46398    46326      -72     
+ Misses       8175     8171       -4     
- Partials     2381     2411      +30     

see 45 files with indirect coverage changes

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[jnidzwetzki]

I like the idea of having this check. However, could you split the commit into (1) removing the telemetry test and (2) introducing this check?

In addition, the files for the telemetry_stats test seem to be different for the PostgreSQL versions.

$ diff --from-file ./tsl/test/expected/telemetry_stats-*
717c717
<     "num_reltuples": 357
---
>     "num_reltuples": 368
747c747
<     "num_reltuples": 340
---
>     "num_reltuples": 329
823c823
<         "uncompressed_row_count": 72,
---
>         "uncompressed_row_count": 56,
832c832
<     "num_reltuples": 285
---
>     "num_reltuples": 312
853c853
<         "uncompressed_row_count": 44,
---
>         "uncompressed_row_count": 60,
862c862
<     "num_reltuples": 296
---
>     "num_reltuples": 269

[fabriziomello]

diff --from-file ./tsl/test/expected/telemetry_stats-*

You're correct @jnidzwetzki ... the output are different, but in another PG16 branch that I'm working they will become equal due to the removal of some multi-node tests, so let's merge here just the new CI check.