Cleanup private registry repositories after each successful test run

[sp1999]

Description of changes: Currently, we had authenticated registry mirror tests failing consecutively due to 500 internal server error. On investigating further, I found out that the registry mirror had consumed it's full storage capacity of 200 GB so the tests weren't able to reach the server. In order to prevent this situation from arising in future, I have added a cleanup step in the registry mirror flow to remove all the repositories in the registry after every successful test run. If a test fails, the repositories will be kept to debug the issue further.

Testing (if applicable): make local-e2e

Documentation added/planned (if applicable):

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.40%. Comparing base (f6a2a83) to head (6536eac). Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8208   +/-   ##
=======================================
  Coverage   73.40%   73.40%           
=======================================
  Files         577      577           
  Lines       35900    35900           
=======================================
  Hits        26352    26352           
  Misses       7882     7882           
  Partials     1666     1666           

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[vivek-koppuru]

/hold