test(registry): create namespace with random name

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.10526% with 11 lines in your changes missing coverage. Please review.

Project coverage is 70.85%. Comparing base (5bf53e0) to head (670c45e).
Report is 407 commits behind head on master.

Files with missing lines	Patch %	Lines
core/testing.go	42.10%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4377      +/-   ##
==========================================
- Coverage   75.45%   70.85%   -4.60%     
==========================================
  Files         202      296      +94     
  Lines       44323    65708   +21385     
==========================================
+ Hits        33444    46559   +13115     
- Misses       9653    17513    +7860     
- Partials     1226     1636     +410     

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