tombstone-ing IPFamily field(15)

[khenidak]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
implements this request #91824 (comment) as a follow up for #91824

Tombstones tag #15 (IPFamilies field of ServiceSpec)

Which issue(s) this PR fixes:
N/A

Special notes for your reviewer:
N/A

Does this PR introduce a user-facing change?:

None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

@khenidak: This issue is currently awaiting triage.

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[khenidak]

/assign @liggitt
/assign @thockin

[thockin]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: khenidak, thockin

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[fejta-bot]

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[khenidak]

/sig network