ci: fix internal gitlab CI

[tomjelinek]

Enhancement:

• use child pipelines to overcome jobs per pipeline limits
• make collecting logs actually work
• get list of tier1 tests automatically

Reason:
get the CI working after recent gitlab changes

Result:
CI is working

Issue Tracker Tickets (Jira or BZ if any):
None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.50%. Comparing base (bd0023a) to head (b0f0f96).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #200       +/-   ##
===========================================
+ Coverage   50.54%   68.50%   +17.95%     
===========================================
  Files           1        3        +2     
  Lines          91      181       +90     
  Branches       12        0       -12     
===========================================
+ Hits           46      124       +78     
- Misses         45       57       +12     

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