feat: TKC-1290: add support for custom CA certificates (#5098)

[dejanzele]

• TKC-1290: add support for custom CA certificates

• TKC-1290: fix failing unit tests for custom CA certificates

Pull request description

Checklist (choose whats happened)

• breaking change! (describe)
• tested locally
• tested on cluster
• added new dependencies
• updated the docs
• added a test

Breaking changes

Changes

Fixes

[netlify]

✅ Deploy Preview for testkube-docs-preview canceled.

Name	Link
🔨 Latest commit	1f4cd38
🔍 Latest deploy log	https://app.netlify.com/sites/testkube-docs-preview/deploys/65f017931764c100089c43fd

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.10811% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 26.79%. Comparing base (27543bb) to head (38a1262).

Files	Patch %	Lines
pkg/agent/agent.go	5.71%	30 Missing and 3 partials ⚠️
pkg/scheduler/service.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5135      +/-   ##
==========================================
- Coverage   26.86%   26.79%   -0.08%     
==========================================
  Files         281      281              
  Lines       25279    25313      +34     
==========================================
- Hits         6791     6782       -9     
- Misses      17795    17834      +39     
- Partials      693      697       +4     

Flag	Coverage Δ
integrationtests	6.65% <0.00%> (-0.01%)	⬇️
unittests	22.17% <8.10%> (-0.07%)	⬇️

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