feat(lb): handle the host parameter in lb backend create|update

[scaleway-bot]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 35.29412% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.78%. Comparing base (eb65e6b) to head (34a9c3d).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../serverless_sqldb/v1alpha1/serverless_sqldb_cli.go	0.00%	12 Missing ⚠️
...namespaces/key_manager/v1alpha1/key_manager_cli.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6128      +/-   ##
==========================================
- Coverage   50.78%   50.78%   -0.01%     
==========================================
  Files         359      359              
  Lines       82294    82326      +32     
==========================================
+ Hits        41797    41809      +12     
- Misses      40497    40517      +20     

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