Revert "Use Patch when syncing GCP BackendService. Linking backend groups still uses Update"

[gauravkghildiyal]

Reverts #2043

This is currently breaking our e2e tests. We'll look at other possible alternatives or try to fix this.

/assign @swetharepakula

[k8s-ci-robot]

Hi @gauravkghildiyal. Thanks for your PR.

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[swetharepakula]

/ok-to-test
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauravkghildiyal, swetharepakula

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