Control Plane changes for Remote Extensions

[awestover]

In #4715 we try to connect to an S3 bucket for a new feature: remote extensions.

In the regression test we pass the remote storage configuration as a CLI ARG, something like

-r {
	"bucket": "neon-dev-extensions-eu-central-1", 
	"region": "eu-central-1", 
	"endpoint": null,
	"prefix": "5174747474"
}

and this is what compute_ctl expects.

This issue:

• Now we need to do this from go control plane.
• Also, we need to make sure that compute_ctl gets the appropriate AWS credentials (probably as environment variables)
• Finally, we need to make the e2e tests test remote extensions

Tasks

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1. Tar Remote Extensions + Parse AWS creds from control plane #4750
   +0
2. neondatabase/cloud#5896

[awestover]

will be resolved by #4750 + https://github.com/neondatabase/cloud/pull/5896

[awestover]

completed