Fix regression in the listBackupSchedule API

[bernardodemarco]

Description

PR #11587 changed the virtualmachineid parameter of the listBackupSchedule API to be optional. However, probably due to a conflict resolution, the change has been lost. As a consequence, the parameter is still required and when trying to access the view of backup schedules through the UI, an exception is thrown:

Therefore, this PR fixes this code regression.

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?

[Pearl1594]

lgtm.

[Pearl1594]

@blueorangutan package

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.59%. Comparing base (04875f1) to head (54cc6f8).

Additional details and impacted files

@@             Coverage Diff              @@
##               4.22   #12402      +/-   ##
============================================
- Coverage     17.59%   17.59%   -0.01%     
+ Complexity    15599    15597       -2     
============================================
  Files          5910     5910              
  Lines        529733   529733              
  Branches      64719    64719              
============================================
- Hits          93215    93208       -7     
- Misses       426025   426033       +8     
+ Partials      10493    10492       -1     

Flag	Coverage Δ
uitests	3.57% <ø> (ø)
unittests	18.66% <ø> (-0.01%)	⬇️

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