[ETL-435] Deny Synapse-connected bucket access outside us-east-1 #49
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This bucket policy update blocks any type of access to a Synapse connected S3 bucket (pre/post ETL buckets) if:
Side note: IAM and Support are global services that have a physical endpoint in us-east-1, so it's not strictly necessary to list them here. But if we ever reuse this code in a different region it's important to allow access to these services.