Ensure that all registry related buckets are appropriately tagged

[iwahbe]

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Issue details

pulumi/registry CI creates a lot of S3 buckets, which need to be cleaned up. Part of that process is identifying which buckets are part of the registry.

We should tag each bucket created by this repo with a clear project: registry, stage: {ci,prod}. We can then limit the bucket cleanup job to look for buckets with those tags.

Affected area/feature