refactor: registry client

[eddycharly]

Signed-off-by: Charles-Edouard Brétéché charles.edouard@nirmata.com

Explanation

This PR refactors registry client:

• removes the global default client
• refactors creation

[codecov]

Codecov Report

Merging #5596 (db4f7a2) into main (616d0d3) will decrease coverage by 0.03%.
The diff coverage is 37.06%.

❗ Current head db4f7a2 differs from pull request most recent head 9e970db. Consider uploading reports for the commit 9e970db to get more accurate results

@@            Coverage Diff             @@
##             main    #5596      +/-   ##
==========================================
- Coverage   36.51%   36.47%   -0.04%     
==========================================
  Files         173      174       +1     
  Lines       19250    19254       +4     
==========================================
- Hits         7029     7023       -6     
- Misses      11430    11440      +10     
  Partials      791      791              

Impacted Files	Coverage Δ
pkg/background/generate/generate.go	0.00% <0.00%> (ø)
pkg/engine/background.go	0.00% <0.00%> (ø)
pkg/engine/generation.go	0.00% <0.00%> (ø)
pkg/engine/imageVerifyValidate.go	11.25% <0.00%> (ø)
pkg/policy/apply.go	0.00% <0.00%> (ø)
pkg/policy/existing.go	0.00% <0.00%> (ø)
pkg/policy/policy_controller.go	7.69% <0.00%> (-0.03%)	⬇️
pkg/policy/updaterequest.go	0.00% <0.00%> (ø)
pkg/registryclient/utils.go	0.00% <0.00%> (ø)
pkg/webhooks/resource/generation/generation.go	0.00% <0.00%> (ø)
... and 10 more

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