Summary:
Ref T5155. Swaps Phabricator over to the new first-party S3 client using the v4 authentication API so it works in all regions.
The API requires an explicit region, so the new `amazon-s3.region` is now required. I'll write guidance about this.
Test Plan:
- Uploaded files to S3.
- Migrated ~1GB of files to S3.
- Loaded a bunch of files off S3.
- Browsed around the S3 bucket.
- Deleted a file, verified the data on S3 was destroyed.
- Hit new setup warning.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T5155
Differential Revision: https://secure.phabricator.com/D14982
cb08757032