PMM-13288 Honour max-query-length parameter for pg_stat_statements.

[BupycHuk]

PMM-13288

Link to the Feature Build: SUBMODULES-3679

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.33%. Comparing base (d9d956c) to head (a96adf7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3119      +/-   ##
==========================================
- Coverage   43.36%   43.33%   -0.04%     
==========================================
  Files         399      399              
  Lines       41661    41658       -3     
==========================================
- Hits        18067    18052      -15     
- Misses      21577    21589      +12     
  Partials     2017     2017              

Flag	Coverage Δ
agent	52.75% <100.00%> (-0.14%)	⬇️

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