Use all Kafka bootstrap servers from Clowder config

[epapbak]

Description

Use all the provided bootstrap servers instead of just the first one

Fixes CCXDEV-11238

Type of change

• New feature (non-breaking change which adds functionality)

Testing steps

Not fully done. The UTs developed cannot be merged (75ff4f1), but I'll keep working on it when I have some time

Checklist

• make before_commit passes
• updated documentation wherever necessary
• added or modified tests if necessary
• updated schemas and validators in insights-data-schemas in case of input/output change

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (e0994cd) 85.77% compared to head (9c8dce0) 92.01%.
Report is 4 commits behind head on main.

Files	Patch %	Lines
ccx_messaging/utils/clowder.py	90.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   85.77%   92.01%   +6.24%     
==========================================
  Files          24       24              
  Lines         703      739      +36     
==========================================
+ Hits          603      680      +77     
+ Misses        100       59      -41     

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[tisnik]

ok