Refactor interface name to use more generic term

[devantler]

This pull request refactors the interface name from IKubernetesGitOpsProvisioner to IGitOpsProvisioner in order to use a more generic term. This change is made in the FluxProvisioner class as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.74%. Comparing base (ae44ae3) to head (b435d0e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
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  Coverage   90.74%   90.74%           
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  Files           4        4           
  Lines          54       54           
  Branches        3        3           
=======================================
  Hits           49       49           
  Misses          5        5           

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