[s3 gateway] Handle all path characters in SigV2 and add Nessie S3-is…

…h test (treeverse#2464)

* Change AWS S3 sigV2 verification to use path as documented by AWS

* Add Nessie S3-ish test

Use the minIO client to test S3 uploads and downloads with both V2 and V4
signatures.  (Unlike the AWS S3 client, the minIO client supports signing
using SigV2.)

* Parallelise S3 gateway test

(Timed out on GCP)

* Add S3 SigV2, SigV4 component tests

Sign using minio, verify using gateway code.

* SigV4: Test bothV4 path and host styles

* Make S3 gateway test pathnames (just) shorter than 1023 chars

* Close channel in Nessie S3 gateway test

Also increase parallelism somewhat.

* [CR] Use t.Errorf.  Kill test if minio client create fails.

Fix the double slash namespace bug (treeverse#2436)

Fix generated Java API client (treeverse#2443)

Had to delete the old one and re(de?)generate a new one: a new
_incompatible_ API was generated to support the added _optional_ argument
`user_metadata`, but our Makefile failed to update the matching test.

Fix generated Java API client (treeverse#2443)

Had to delete the old one and re(de?)generate a new one: a new
_incompatible_ API was generated to support the added _optional_ argument
`user_metadata`, but our Makefile failed to update the matching test.

Fix ARNs parsing confusion when the account-ID field contained a slas…

…h or the resource-ID a colon. (treeverse#2439)

* Fix bug parsing ARNs with resource ID containing a colon

Code was confused about account IDs vs. resource IDs.  Just split on colons
and remove a confused implementation of resource types inside ARNs.

1. This does not apply to AWS ARN account IDs, ever.
1. Something similar *does* apply to AWS resource IDs: a resource ID may
   start with a resource type, which indeed gets a separator that may be a
   colon or a slash.
1. This implementation DOES NOT SUPPORT resource types.  lakeFS does not
   appear to use them anywhere.  (The previous implementation did not
   support them, either!).

* Update CHANGELOG

Fix workflow bugs (treeverse#2391)

Update CHANGELOG before release 0.47.0 (treeverse#2303)

Edit changelog (treeverse#2261)

Edit changelog (treeverse#2261)

Update CHANGELOG.md (treeverse#2210)

* Update CHANGELOG.md

* Update CHANGELOG.md