ci: document how to test the stable pipeline

[tonsV2]

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[codecov]

Codecov Report

Merging #15709 (7a1f4b6) into master (d8e14c5) will increase coverage by 6.10%.
Report is 24 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15709      +/-   ##
============================================
+ Coverage     60.18%   66.29%   +6.10%     
- Complexity    28454    31366    +2912     
============================================
  Files          3487     3485       -2     
  Lines        129907   129964      +57     
  Branches      15170    15196      +26     
============================================
+ Hits          78186    86156    +7970     
+ Misses        45137    36720    -8417     
- Partials       6584     7088     +504     

Flag	Coverage Δ
integration	50.02% <ø> (+0.23%)	⬆️
integration-h2	32.34% <ø> (?)
unit	30.27% <ø> (-0.06%)	⬇️

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see 676 files with indirect coverage changes

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[radnov]

Looks good, added a few comments.

Also, I don't think the delete-remote-docker-image.sh should be in the jenkinsfiles dir, as it's not a Jenkinsfile and it's not used by one. I'd add it in a scripts dir (as mentioned in this Jira task).

[sonarqubecloud]

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