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 30.54%. Comparing base (97c263a) to head (896fa66).
⚠️ Report is 5 commits behind head on main.

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

❗ There is a different number of reports uploaded between BASE (97c263a) and HEAD (896fa66). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (97c263a)	HEAD (896fa66)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5375       +/-   ##
===========================================
- Coverage   46.39%   30.54%   -15.86%     
===========================================
  Files         176      101       -75     
  Lines       18412    11668     -6744     
===========================================
- Hits         8543     3564     -4979     
+ Misses       9869     8104     -1765     

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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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