kafka: use clowder KafkaServers

[ldjebran]

Description

To allow multi kafka servers usage, use clowder KafkaServers.

FIXES: https://issues.redhat.com/browse/THEEDGE-3708

Type of change

What is it?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update
• Tests update
• Refactor

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I run make pre-commit to check fmt/vet/lint/test-no-fdo

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad865f3) 62.72% compared to head (6f1bf74) 62.72%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2318   +/-   ##
=======================================
  Coverage   62.72%   62.72%           
=======================================
  Files          87       87           
  Lines       12985    12986    +1     
=======================================
+ Hits         8145     8146    +1     
  Misses       4169     4169           
  Partials      671      671           

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[omaciel]

/lgtm