[chore] Fix double start of operator in tests

[andreaTP]

This fixes the problem with the double start of the operator.
Unfortunately, it doesn't fix this TODO:

apicurio-registry/operator/controller/src/test/java/io/apicurio/registry/operator/it/SmokeITTest.java

Line 173 in c86311b

// TODO: The remote test does not work properly. As a workaround the CR will be deleted and recreated

@jsenko do you want to take a look?

[jsenko]

This fixes the problem with the double start of the operator. Unfortunately, it doesn't fix this TODO:

apicurio-registry/operator/controller/src/test/java/io/apicurio/registry/operator/it/SmokeITTest.java

Line 173 in c86311b

// TODO: The remote test does not work properly. As a workaround the CR will be deleted and recreated

@jsenko do you want to take a look?

I tried to figure it out https://github.com/jsenko/apicurio-registry/tree/fix-operator-double-start-test but the remote test is still failing. It looks like the REGISTRY_API_URL variable is not removed even if it has been removed from the desired Deployment. So I don't know, it might be a bug in JOSDK?

[andreaTP]

So I don't know, it might be a bug in JOSDK?

Would you be up doing a pairing session on this?
This PR should go in anyhow I guess ...