feat(load-balancer): ignore nodes that don't use known provider IDs

[lukasmetzner]

With this feature the load balancer is more resilient to hybrid clusters as it skips nodes with unkown provider ids.

[codecov]

Codecov Report

Attention: Patch coverage is 3.70370% with 26 lines in your changes missing coverage. Please review.

Project coverage is 69.77%. Comparing base (006b0ad) to head (3e98ad9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/hcops/load_balancer.go	0.00%	11 Missing ⚠️
internal/providerid/providerid.go	11.11%	8 Missing ⚠️
hcloud/instances.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #780      +/-   ##
==========================================
- Coverage   70.29%   69.77%   -0.53%     
==========================================
  Files          31       31              
  Lines        3205     3229      +24     
==========================================
  Hits         2253     2253              
- Misses        779      803      +24     
  Partials      173      173              

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