Use SetLabels() to set ForwardingRules labels

[bfournie]

trafficstars

What type of PR is this? /kind bug

What this PR does / why we need it:

The ForwardingRules resource requires that the SetLabels() method be used to add the labels after the resource has been created. This resource is different than, for example, Instances or Disks. See Issue #1276 for more information.

Which issue(s) this PR fixes Fixes #1276

Special notes for your reviewer:

This is the comment for ForwardingRules in https://github.com/googleapis/google-api-go-client/blame/main/compute/v1/compute-gen.go

       // Labels: Labels for this resource. These can only be added or modified
       // by the setLabels method. 
        Labels map[string]string `json:"labels,omitempty"

TODOs:

• [x] squashed commits
• [ ] includes documentation
• [ ] adds unit tests

Release note:

"NONE"

[k8s-ci-robot]

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[richardcase]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bfournie, richardcase

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