MESH-5405-Create prefixed SEs

[Punakshi]

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Checklist

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Description

What does this change do and why? Handles the canary, bluegreen, deployment to rollout migration

[Link to related ISSUE]

Thank you!

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Codecov Report

Attention: Patch coverage is 37.25490% with 128 lines in your changes missing coverage. Please review.

Project coverage is 71.02%. Comparing base (61e7c3f) to head (e553489).

Files with missing lines	Patch %	Lines
admiral/pkg/registry/testutils.go	9.09%	100 Missing :warning:
admiral/pkg/clusters/serviceentry.go	15.00%	17 Missing :warning:
admiral/pkg/clusters/configwriter.go	85.50%	5 Missing and 5 partials :warning:
admiral/pkg/clusters/util.go	50.00%	1 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
- Coverage   71.83%   71.02%   -0.81%     
==========================================
  Files          66       66              
  Lines        9269     9394     +125     
==========================================
+ Hits         6658     6672      +14     
- Misses       2251     2359     +108     
- Partials      360      363       +3     

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[rtay1188]

Looks good - only thing is that need some comments to explain the service map structure and expectations of state syncer. Meaning, we should only have default and test keys, should only have one service in the array value for the test key, etc. (in getServiceEntryEndpoints)