* fix(s3): s3:PutObject bucket policy now implicitly allows multipart uploads
The PolicyEngine.evaluateStatement() method used raw regex matching for
actions, bypassing the multipart-inherits-PutObject logic that only
existed in the unused CompiledStatement.MatchesAction() code path.
When a bucket policy granted only s3:PutObject, multipart upload
operations (CreateMultipartUpload, UploadPart, CompleteMultipartUpload,
etc.) were denied, forcing users to explicitly list every multipart
action.
Fixes https://github.com/seaweedfs/seaweedfs/discussions/8751
* fix(s3): add s3:UploadPartCopy to multipartActionSet and improve test coverage
Add missing S3_ACTION_UPLOAD_PART_COPY constant and include it in
multipartActionSet so UploadPartCopy is implicitly allowed by s3:PutObject.
Also add a bucket-ARN sub-test for ListBucketMultipartUploads to verify
that an object-only resource pattern does not match bucket-level requests.
see https://blog.aqwari.net/xml-schema-go/
1. go get aqwari.net/xml/cmd/xsdgen
2. Add EncodingType element for ListBucketResult in AmazonS3.xsd
3. xsdgen -o s3api_xsd_generated.go -pkg s3api AmazonS3.xsd
4. Remove empty Grantee struct in s3api_xsd_generated.go
5. Remove xmlns: sed s'/http:\/\/s3.amazonaws.com\/doc\/2006-03-01\/\ //' s3api_xsd_generated.go
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