Update migrate_schema to use check_migrations

[aldato]

SUMMARY

We've seen the following errors in the operator logs (trimmed most of the output log since it's not required):

[installer : Create kubernetes job to perform the migration] **************\r\ntask path:

---

ResourceClaims:[]core.PodResourceClaim(nil)}}: field is immutable\\\",\\\"field\\\":\\\"spec.template\\\"}]},\\\"code\\\":422}\\\\n'\", \"reason\": \"Unprocessable Entity\", \"status\": 422}\n\r\n

PLAY RECAP *********************************************************************

\r\nlocalhost                  : ok=73   changed=0    unreachable=0    failed=1    skipped=76   rescued=0    ignored=0

If we check the output of the main conditional we can see that we've two unexpected results:

$ awx-manage showmigrations | grep -v '[X]' | grep '[ ]' | wc -l
2

$ awx-manage showmigrations | grep -v '[X]' | grep '[ ]'
 (no migrations)
 (no migrations)

They belong to:

dab_jwt_consumer
 (no migrations)
dab_rest_filters
 (no migrations)

The block interprets there are pending migrations when that's not the case and tries to edit the k8s job that already ran. If there are changes in the AutomationController CR it tries to change the k8s job spec.template, which is immutable.

ISSUE TYPE

• Bug, Docs Fix or other nominal change