feat: Add try/except block to maintenance windows flow

[diegovb-sys]

Closes #5374

📑 Description

This PR only wraps the function to check if an alert is inside of a maintenance window with a try/except block.

✅ 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

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.39%. Comparing base (57ca737) to head (fddaf9c).
⚠️ Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
keep/api/bl/maintenance_windows_bl.py	0.00%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5375      +/-   ##
==========================================
- Coverage   46.64%   46.39%   -0.26%     
==========================================
  Files         175      176       +1     
  Lines       18263    18415     +152     
==========================================
+ Hits         8519     8543      +24     
- Misses       9744     9872     +128     

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[talboren]

LGTM

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
keep	Ignored	Preview		Oct 20, 2025 0:33am

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