feat: idp v2 api GetIDPByID (#8425)

# Which Problems Are Solved

GetIDPByID as endpoint in the API v2 so that it can be available for the
new login.

# How the Problems Are Solved

Create GetIDPByID endpoint with IDP v2 API, throught the GetProviderByID
implementation from admin and management API.

# Additional Changes

- Remove the OwnerType attribute from the response, as the information
is available through the resourceOwner.
- correct refs to messages in proto which are used for doc generation
- renaming of elements for API v3

# Additional Context

Closes #8337

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/grpc/management/idp.go

@@ -149,7 +149,7 @@ func (s *Server) GetProviderByID(ctx context.Context, req *mgmt_pb.GetProviderBy
 	if err != nil {
 		return nil, err
 	}
-	idp, err := s.query.IDPTemplateByID(ctx, true, req.Id, false, orgIDQuery)
+	idp, err := s.query.IDPTemplateByID(ctx, true, req.Id, false, nil, orgIDQuery)
 	if err != nil {
 		return nil, err
 	}