Set up Argo Ephemeral Environments/Stage Preview for Sync

[data-sync-user]

Given what is laid out in https://docs.google.com/document/d/1iBSIFkIq6oxL44X2ozJNbBhX4PZA1eILdyD4NZS3OBw/edit?tab=t.0#heading=h.x6edwzufrl7r

https://docs.google.com/document/d/1iBSIFkIq6oxL44X2ozJNbBhX4PZA1eILdyD4NZS3OBw/edit?tab=t.0#heading=h.x6edwzufrl7r , we’re interested in trying out ephemeral envs/stage preview in sync.

We would like to implement the staged preview/ephemeral environment given we are migrated to GCPv2 and on Argo Rollouts. This would be very helpful for testing purposes and validating our rapid release approach.

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