feat(load-balancer): add service data source

[phm07]

This PR adds a dedicated data source for Load Balancer Services. The services field in the original Load Balancer data source was not populated and is deprecated after this PR.

Fixes #1413 and #1136

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.99%. Comparing base (93291f4) to head (e15ac4d).

Files with missing lines	Patch %	Lines
internal/loadbalancer/data_source_service.go	90.56%	9 Missing and 6 partials ⚠️
internal/loadbalancer/data_source_service_list.go	77.77%	7 Missing and 5 partials ⚠️
internal/loadbalancer/model.go	99.03%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1426      +/-   ##
==========================================
+ Coverage   73.29%   73.99%   +0.69%     
==========================================
  Files         116      118       +2     
  Lines       12804    13124     +320     
==========================================
+ Hits         9385     9711     +326     
+ Misses       2344     2325      -19     
- Partials     1075     1088      +13     

Flag	Coverage Δ
e2e	73.99% <91.30%> (+0.69%)	⬆️
unit	38.06% <44.09%> (+0.14%)	⬆️

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[jooola]

Did a first pass, looks good. It needs some more work though.

[jooola]

A bunch of things to address and the tests are missing.

For the tests, please try to test fetching the 3 protocols (tcp, http, https).