Fix non-deterministic cagg_insert isolation test

[jnidzwetzki]

One permutation of the cagg_insert isolation test contains an assumption about the execution order of three processes after a lock is released. However, this behavior is non-deterministic. This PR makes the assumption explicit and adds proper markers to the isolation test to make the output deterministic.

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[codecov]

Codecov Report

Merging #6030 (9275669) into main (3b6dc7d) will decrease coverage by 5.93%.
Report is 3 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6030      +/-   ##
==========================================
- Coverage   87.14%   81.21%   -5.93%     
==========================================
  Files         243      243              
  Lines       55969    55925      -44     
  Branches    12397    12378      -19     
==========================================
- Hits        48775    45421    -3354     
- Misses       4856     8169    +3313     
+ Partials     2338     2335       -3     

see 94 files with indirect coverage changes

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[github-actions]

@shhnwz, @mahipv: please review this pull request.

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[timescale-automation]

Automated backport to 2.11.x not done: cherry-pick failed.

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HEAD detached at origin/2.11.x
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	both modified:   tsl/test/isolation/specs/cagg_insert.spec

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