This commit adds an 'IgnoreObjectConversionErrors' option to the
validation testing framework in 'k8s.io/apimachinery' and exposes it
via 'pkg/api/testing'.
This is useful for fuzzing tests where we might want to skip object
versions that cannot be converted from the internal version (e.g. due to
missing fields or incompatible types in older versions) but still want
to test validation for the versions that *can* be converted.
The 'autoscaling' group versions are added to 'TestVersionedValidationByFuzzing'
with this option enabled.
Introduces new testing helpers to simplify testing of declarative validation rules. The new `VerifyValidationEquivalence` and `VerifyUpdateValidationEquivalence` functions reduce boilerplate by encapsulating the logic for:
- Toggling the `DeclarativeValidation` and `DeclarativeValidationTakeover` feature gates.
- Comparing the validation output from the imperative and declarative paths.
The declarative validation tests for CertificateSigningRequest and ReplicationController are updated to use these new, simpler helpers.
This makes a bold assumption: that the errors (count and basic content)
will be the same across versions. If this turns out to be untrue, this
may need to get more sophisticated. It should fail obviously when we
hit that edge.
