refactor: remove NATs deprecated features

[Tochemey]

closes #439

[codecov]

Codecov Report

Attention: Patch coverage is 70.58824% with 10 lines in your changes missing coverage. Please review.

Project coverage is 86.00%. Comparing base (1c29b18) to head (30f2bfc).
Report is 1 commits behind head on main.

Files	Patch %	Lines
discovery/nats/discovery.go	70.58%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #441      +/-   ##
==========================================
- Coverage   86.08%   86.00%   -0.09%     
==========================================
  Files          47       47              
  Lines        3537     3545       +8     
==========================================
+ Hits         3045     3049       +4     
- Misses        346      349       +3     
- Partials      146      147       +1     

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