Fix VMScheduler unit test for daylight saving time

[sureshanaparti]

Description

This PR fixes VMScheduler unit test for daylight saving time.

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?

Manually verified the unit test.

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

[DaanHoogland]

clgtm, tested the code locally

[Copilot]

Pull Request Overview

This PR fixes a daylight saving time (DST) issue in the VMScheduler unit test by replacing date arithmetic that could be affected by DST transitions with timezone-aware date calculations.

Key Changes:

• Replaced DateUtils.addDays() with ZonedDateTime.plusDays() to ensure DST-safe date arithmetic

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 16.18%. Comparing base (e333ce9) to head (e31efa4).
⚠️ Report is 1 commits behind head on 4.20.

Additional details and impacted files

@@            Coverage Diff            @@
##               4.20   #11907   +/-   ##
=========================================
  Coverage     16.18%   16.18%           
- Complexity    13302    13306    +4     
=========================================
  Files          5657     5657           
  Lines        498464   498464           
  Branches      60491    60491           
=========================================
+ Hits          80674    80696   +22     
+ Misses       408810   408787   -23     
- Partials       8980     8981    +1     

Flag	Coverage Δ
uitests	4.00% <ø> (ø)
unittests	17.04% <ø> (+<0.01%)	⬆️

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[Pearl1594]

lgtm

[DaanHoogland]

build passes and only a unit test => merging