[Chore] Long running test for TempoStack global retention

[IshwarKanse]

The PR adds a long running test for TempoStack retention.

--- PASS: chainsaw (0.00s)
    --- PASS: chainsaw/tempostack-retention-global (2860.06s)
PASS
Tests Summary...
- Passed  tests 1
- Failed  tests 0
- Skipped tests 0
Done.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.10%. Comparing base (0c5313e) to head (bbbff00).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1035   +/-   ##
=======================================
  Coverage   73.10%   73.10%           
=======================================
  Files         106      106           
  Lines        6630     6630           
=======================================
  Hits         4847     4847           
  Misses       1493     1493           
  Partials      290      290           

Flag	Coverage Δ
unittests	73.10% <ø> (ø)

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