[GITOPS-8560]: Validation webhook to reject invalid SSO configs in ArgoCD CR

[akhilnittala]

What type of PR is this?

/kind enhancement

What does this PR do / why we need it:
When both sso and oidc config is provided in argocd, we are not rejecting the request. so with this pr changes, we have implemented validation webhook which rejects the request with argocd CR sso and oidc configuration.
Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:
https://issues.redhat.com/browse/GITOPS-8560
Fixes #?
https://issues.redhat.com/browse/GITOPS-8560
How to test changes / Special notes to the reviewer:

1. install argocd operator with changes
2. create argo cd CR with both sso and oidc config
3. request should be rejected.

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