Adding annotation to enable Global Access for L7 ILBs

[aaronmaxlevy]

This addresses #1883 and #1887 .

While I understand that Google doesn't intend to invest much in Ingress going forward, in favor of the Gateway API, there are enough existing Helm charts, etc. out there that use Ingress, where it arguably makes sense to add something like this which is both high impact and relatively low effort to implement.

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/remove-lifecycle stale

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/close

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@k8s-triage-robot: Closed this PR.

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/reopen

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[aaronmaxlevy]

/remove-lifecycle rotten

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/lifecycle stale

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/lifecycle rotten

[aaronmaxlevy]

/remove-lifecycle rotten