Update Ingress overrides behaviour

[viniciusdc]

related to #1418

Changes introduced in this PR:

• FIxed incorrect assignment of load balancer annotations, from kubernetes_service.spec.selector to kubernetes_service.metadata according to documentation and vide example
• Updated variable type, from map(object({...})) to map(string), as object restricts the variable structure to match object specification.

Types of changes

What types of changes does your PR introduce?

Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests?

• Yes
• No

Documentation

Does your contribution include breaking changes or deprecations?
If so have you updated the documentation?

• Yes, docstrings
• Yes, main documentation
• Yes, deprecation notices

Further comments (optional)

Tested with local deployment and inspect that the proper values were set:

[terraform]:   # module.kubernetes-ingress.kubernetes_service.main will be created
[terraform]:   + resource "kubernetes_service" "main" {
[terraform]:       + id                     = (known after apply)
[terraform]:       + status                 = (known after apply)
[terraform]:       + wait_for_load_balancer = true
[terraform]: 
[terraform]:       + metadata {
[terraform]:           + annotations      = {
[terraform]:               + "networking.gke.io/internal-load-balancer-subnet" = "pre-existing-subnet"
[terraform]:               + "networking.gke.io/load-balancer-type"            = "Internal"
[terraform]:             }
[terraform]:           + generation       = (known after apply)
[terraform]:           + name             = "qhub-traefik-ingress"
[terraform]:           + namespace        = "dev"
[terraform]:           + resource_version = (known after apply)
[terraform]:           + uid              = (known after apply)
[terraform]:         }

[iameskild]

Looks good to me sir 💯

[costrouc]

Thanks for the PR @viniciusdc ! Looks great to me.