scripts: fixed kurtosis alerts script

[pinebit]

Fixed false-negative triggers when fetching alerts: e.g. when alert(s) was firing before we track the transition, but it was never released to normal during the test. Hence we added "lookback" parameter to see the initial alert state.

category: test
ticket: none

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.61%. Comparing base (20cfcad) to head (d393ce1).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4458      +/-   ##
==========================================
+ Coverage   56.55%   56.61%   +0.05%     
==========================================
  Files         245      245              
  Lines       32826    32826              
==========================================
+ Hits        18565    18583      +18     
+ Misses      11898    11889       -9     
+ Partials     2363     2354       -9     

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[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