DNSEndpoints name conflict

If a user creates a DNSRegistration with the FQDNS:

• test.web.cern.ch (internal & external)
• test.webtest.cern.ch (internal)

The operator will try to create 3 DNSEndpoints (one for each view/zone) with the names "dnsregistration-" + string(dnsRegistrationUID) this used to work because we had different GVKs, now with a single GVK this is not the case anymore.

Tasks:

• Come up with a new naming convention
• Implement the new naming convention
• Create E2E tests to test this condition

CC @kosamara @alossent