feat(groups): Add provider to AddGroupSAMLLinkOptions

Mohamed Othmanrequested to merge
gitlab-community/gitlab-org/api/client-go:add-provider-for-saml-group-link into main

What does this MR do?

Adds the provider attribute to AddGroupSAMLLinkOptions and the SAMLGroupLink response struct.

Why is this needed?

This ensures the go-gitlab SDK has full feature parity with the GitLab SAML group links API, allowing users to configure specific identity providers for their SAML mappings.

Related Issues

Closes #2227 (closed)

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