feat: add Kubernetes-based e2e testing infrastructure

[TerryHowe]

This commit adds comprehensive Kubernetes-based end-to-end testing support for ORAS. GitHub Actions workflow for automated KinD-based testing This maintains compatibility with existing Docker-based e2e tests while adding a more realistic Kubernetes-based testing environment.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 87.33%. Comparing base (7ab61a4) to head (64af1de).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1913      +/-   ##
==========================================
+ Coverage   87.29%   87.33%   +0.03%     
==========================================
  Files         143      143              
  Lines        5535     5535              
==========================================
+ Hits         4832     4834       +2     
+ Misses        417      415       -2     
  Partials      286      286              

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