feat: [SKU modularization] remove sku_config from v1alpha1 and implement skuHandler interface

[smritidahal653]

Reason for Change:

• sku_config is Azure cloud specific, this is replaced by skuHandler interface as a part of the effort to modularize gpu skus. Deleting it from the v1alpha1 package
• Implementing skuHandler to get gpu configs in place where SupportedGPUConfigs was used from sku_config file
• Fixing test cases to use updated skus after skuHandler implementation

Requirements

• added unit tests and e2e tests (if applicable).

Notes for Reviewers:

[codecov]

Codecov Report

Attention: Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 55.71%. Comparing base (5c30038) to head (d47fce4).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
api/v1alpha1/workspace_validation.go	72.72%	2 Missing and 1 partial ⚠️
pkg/utils/common-preset.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
- Coverage   58.18%   55.71%   -2.48%     
==========================================
  Files          30       30              
  Lines        2987     3116     +129     
==========================================
- Hits         1738     1736       -2     
- Misses       1149     1279     +130     
- Partials      100      101       +1     

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