fix: use http to make request to gRPC server

[ahmad-ibra]

Addresses this error encountered during tests:

ERROR    controllers.ValidatorConfig    Failed to emit FinalizeCleanup request    {"error": "FinalizeCleanup request to https://validator-cleanup-service:3006 failed: unavailable: http: server gave HTTP response to HTTPS client"}

[codecov]

Codecov Report

Merging #157 (0107bc4) into main (2ae0348) will increase coverage by 0.33%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   56.69%   57.03%   +0.33%     
==========================================
  Files           9        9              
  Lines         889      889              
==========================================
+ Hits          504      507       +3     
+ Misses        357      356       -1     
+ Partials       28       26       -2     

Files	Coverage Δ
internal/controller/validatorconfig_controller.go	78.29% <100.00%> (+1.16%)	⬆️

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