Validate worker node kubernetes version with the template name

[panktishah26]

Description of changes:
We need to validate worker node specific kubernetes version (if present) in case of modular upgrade with the template name field. The template name field should contain the kubernetes version specified in the workernode configuration if the upgrade type is modular upgrade.

Testing (if applicable):

Documentation added/planned (if applicable):

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (3d5bbb1) 72.01% compared to head (8832ba7) 72.01%.
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6828      +/-   ##
==========================================
- Coverage   72.01%   72.01%   -0.01%     
==========================================
  Files         532      532              
  Lines       41669    41640      -29     
==========================================
- Hits        30010    29987      -23     
+ Misses       9984     9980       -4     
+ Partials     1675     1673       -2     

Files	Coverage Δ
pkg/providers/cloudstack/validator.go	71.51% <100.00%> (+3.73%)	⬆️

... and 10 files with indirect coverage changes

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[chrisdoherty4]

See the inline comment. I don't think we're doing quite the right checks with these changes and I think the code could benefit from a small refactor to make it clear what our expectations are.

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