* fix: reject ListMultipartUploads requests that also carry uploadId
A bucket GET with both the uploads and uploadId query parameters was
routed to ListMultipartUploads and answered with the upload listing.
S3 rejects the combination with 400 InvalidArgument, "Conflicting query
string parameters: uploadId, uploads".
Add an error route for the combination ahead of ListMultipartUploads,
the way the object level '?uploads' request is rejected, and enable
the REST test that covers it.
Fixes#2155
* fix: reject uploads with uploadId for every bucket and object operation
Requests carrying both the uploads and uploadId query parameters were
only rejected for a bucket GET, so DELETE, PUT, POST and HEAD on the
bucket or object paths still ran real operations. S3 rejects the
combination for every method on both paths, before authentication and
before checking that the bucket exists.
Register the error route for all methods on the bucket and object
routers right after the CORS middleware is set up, ahead of every other
route, and cover each method and path with an integration test.