Add translation for GKE Custom health check

[sawsa307]

What type of PR is this? /kind feature

What this PR does / why we need it: Adding a new feature for GKE Ingress and Gateway conversion.

Which issue(s) this PR fixes: Adding more feature for #87.

Does this PR introduce a user-facing change?:

Ingress2gateway now supports translating Custom Health Check on GKE Ingress to HealthCheckPolicy on GKE Gateway.

[sawsa307]

/assign @LiorLieberman /assign @spencerhance

[sawsa307]

/hold Wait until #191 and #193 get merged.

[sawsa307]

/unhold

[sawsa307]

/retest

[LiorLieberman]

Hi, just checking in, anything I can do to help with this?

Ca this be reviewed by someone from GKE? /cc @spencerhance @robscott

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, sawsa307

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[LiorLieberman]

/lgtm /hold for @robscott to check the changes he requested are in

[robscott]

Thanks @sawsa307!

/lgtm /hold cancel

[robscott]

/lgtm