Show time correctly in the backup schedule UI

[abh1sar]

Description

This PR fixes #11928

1. Display time in human readable format
2. Disable the interval for which a schedule is already created as one interval can only have one schedule.

The behaviour is similar to the Create Recurring Snapshots UI.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

Screen.Recording.2025-11-07.at.9.49.10.AM.mov

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.56%. Comparing base (ac8c200) to head (3bc4fa9).
⚠️ Report is 9 commits behind head on 4.22.

Additional details and impacted files

@@             Coverage Diff              @@
##               4.22   #12012      +/-   ##
============================================
- Coverage     17.56%   17.56%   -0.01%     
  Complexity    15544    15544              
============================================
  Files          5909     5909              
  Lines        529059   529065       +6     
  Branches      64617    64619       +2     
============================================
  Hits          92941    92941              
- Misses       425664   425670       +6     
  Partials      10454    10454              

Flag	Coverage Δ
uitests	3.58% <ø> (-0.01%)	⬇️
unittests	18.63% <ø> (ø)

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[DaanHoogland]

@blueorangutan ui

[blueorangutan]

@DaanHoogland a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: ✔️
Live QA URL: https://qa.cloudstack.cloud/simulator/pr/12012 (QA-JID-792)

[abh1sar]

@blueorangutan ui

[blueorangutan]

@abh1sar a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: ✔️
Live QA URL: https://qa.cloudstack.cloud/simulator/pr/12012 (QA-JID-793)

[DaanHoogland]

clgtm