chore(AutoDiscoverProvider): implements conflicts discovery

[alcidesmig]

Description

I recently went through a scenario where using an RKE2 cluster it was necessary to create the GKEBackendConfig to maintain compatibility during the migration of some services. Because of this, the networking.gke.io/v1 group was created in the cluster and this caused the tigera/operator to erroneously infer the kubernetesProvider field and lead us to a failure scenario.
Considering this scenario and other similar ones, this MR implements the detection of conflicts during the inference of the Kubernetes Provider, generating an error if more than one provider is detected.

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.

[CLAassistant]

All committers have signed the CLA.