fix: Add support to customize ignorable statuses for maintenance windows

[VladimirFilonov]

Closes #4809

📑 Description

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
keep	⬜️ Ignored (Inspect)	Visit Preview		May 16, 2025 0:47am

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 30.79%. Comparing base (7d126de) to head (3dbd09c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
keep/api/bl/maintenance_windows_bl.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4817       +/-   ##
===========================================
- Coverage   46.14%   30.79%   -15.36%     
===========================================
  Files         165       93       -72     
  Lines       17428    11000     -6428     
===========================================
- Hits         8043     3387     -4656     
+ Misses       9385     7613     -1772     

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