fix(tests): Remove invalid CRD placeholder file

Removed adapters/vnf-operator/config/crd/bases/_.yaml:
- This was an invalid placeholder CRD with empty fields
- Caused NoResourceMatchError and NoKindMatchError in tests
- envtest was trying to load it and failing
- Only valid CRD (mano.oran.io_vnfs.yaml) should be in this directory

Fixes VNF Controller test failures:
- Should create VNF with RAN type successfully
- Should create VNF with CN type successfully
- Should reconcile VNF through pending to creating state
- Should validate QoS parameters
- Should handle VNF deletion with finalizer
- Should handle different VNF types

Author: thc1006