feat: warn on deprecated or unconfigured lb type

[lukasmetzner]

This PR adds a warning log message and event, if a Load Balancer Type is deprecated. If the Load Balancer Type is unavailable an error message is returned.

This PR adds a warning log message and event, if a Load Balancer Type is not configured by a user through the annotation or a cluster-wide default via environment variables.

Load Balancer Types are cached using our generic cache built for instances.

feat(load-balancer): warn on deprecated Load Balancer Type
feat(load-balancer): warn on unconfigured Load Balancer Type

[codecov]

Codecov Report

❌ Patch coverage is 76.82927% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.67%. Comparing base (18e0434) to head (c6f741a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/hcops/load_balancer.go	63.82%	11 Missing and 6 partials ⚠️
internal/hcops/testing.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1313      +/-   ##
==========================================
+ Coverage   71.28%   71.67%   +0.38%     
==========================================
  Files          27       29       +2     
  Lines        2807     2877      +70     
==========================================
+ Hits         2001     2062      +61     
- Misses        622      629       +7     
- Partials      184      186       +2     

Flag	Coverage Δ
e2e	45.58% <51.21%> (+0.77%)	⬆️
unit	67.63% <71.95%> (-0.02%)	⬇️

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