fix: add organizationID query for user v2 ListUsers and clean up depeprecated attribute (#7593)

Add organizationID as query for ListUsers and clean up the deprecated Organisation attributes in other queries.

This PR removes the following fields from API requests (user service v2):

organisation from AddHumanUser (deprecated some time ago, organization still exists)
organization from GetUserByID

pkg/grpc/user/v2beta/user.go

@@ -1,13 +1,3 @@
 package user
 
-type SearchQuery_ResourceOwner struct {
-	ResourceOwner *ResourceOwnerQuery
-}
-
-func (SearchQuery_ResourceOwner) isSearchQuery_Query() {}
-
-type ResourceOwnerQuery struct {
-	OrgID string
-}
-
 type UserType = isUser_Type