fix: Add BackendLBPolicy to experimental kustomization

[krouma]

Kustomization does not install this new CRD because it is not on the list of resources.

What type of PR is this?

/kind bug

What this PR does / why we need it:
Fixes installation of experimental CRDs using kustomization.

Which issue(s) this PR fixes:

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

• ✅login: krouma / (8549edf)

The committers listed above are authorized under a signed CLA.

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[k8s-ci-robot]

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[robscott]

Thanks @krouma!

/approve

[robscott]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[robscott]

/lgtm