*: longer kurtosis test window

[pinebit]

• Default cluster lifetime is now 90 minutes.
• Fallback lifetime values are now 90.
• Alert checks now ignore the first 30m and last 10m.
• Alert window is now computed as deploy_start + 30m through deploy_start + lifetime - 10m.

category: misc
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.67%. Comparing base (2c42245) to head (897f117).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4539      +/-   ##
==========================================
- Coverage   57.01%   56.67%   -0.34%     
==========================================
  Files         245      245              
  Lines       32971    33003      +32     
==========================================
- Hits        18799    18706      -93     
- Misses      11789    11940     +151     
+ Partials     2383     2357      -26     

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