[release-1.4] Update CRD generator to handle errors encountered during generation

[weisdd]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

In #4158, there was a fix for kubebuilder annotations that, unfortunately, did not make it to the recent v1.4.1 due to a failed automated cherrypick attempt.

As suggested by @rikatz here, this PR contains a cherrypick of the commit from #4158, just in case there will be v1.4.2.

Does this PR introduce a user-facing change?:

The ExternalAuth HTTPRouteFilter now enforces a maximum of 64 items in the following fields:

- `grpc.allowedHeaders`
- `http.allowedHeaders`
- `http.allowedResponseHeaders`

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[robscott]

Thanks @weisdd! Not sure if we'll find time to get another patch release out before v1.5, but approving in case we do.

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, weisdd

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