feat(api): add full proxy mode to api module

[floreks]

Ensure that there are no in-cluster client calls when running in proxy mode.

[maciaszczykm]

/lgtm

[codecov]

Codecov Report

Merging #8766 (7b15284) into master (dbe7a46) will decrease coverage by 0.05%.
Report is 2 commits behind head on master.
The diff coverage is 12.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8766      +/-   ##
==========================================
- Coverage   35.64%   35.59%   -0.05%     
==========================================
  Files         255      255              
  Lines       10770    10782      +12     
  Branches      158      142      -16     
==========================================
- Hits         3839     3838       -1     
- Misses       6680     6731      +51     
+ Partials      251      213      -38     

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floreks, maciaszczykm

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.