* Remove Region field from S3 datasource editor page for AWS S3, Upcloud, Digital Ocean Spaces, Dream Objects, Wasabi.
* Use SDK provided property for AWS S3 to delegate region selection to the SDK.
* Extract region info from endpoint URL for Upcloud, Digital Ocean Spaces, Dream Objects and Wasabi, since the SDK property does not work for these service providers.
* Removed some redundant checks from datasourceCreate that were already part of validateDatasource
* Fix show clause in list.json
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