PlanResourceChange causes failing tests related to buckets

[VenelinMartinov]

What happened?

I attempted to enroll gcp bucket into PlanResourceChange and got a ton of failing tests. Debugged for a bit and noticed that our representation of labels has changed - no labels used to be stored as {} and change to nil after PlanResourceChange

Example

https://github.com/pulumi/pulumi-gcp/actions/runs/8804981419/job/24167273512

Output of pulumi about

.

Additional context

No response

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[pulumi-bot]

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