Allow Pseudonymizer to write to a bucket without having permissions to see all buckets

Calling `Fog::Storage::AWS::Directories#get` requires the ListAllMyBuckets
permission, but we can avoid that extra query and permission by initializing
the directory with a specific bucket.

ee/changelogs/unreleased/sh-fix-meltano-upload.yml

+---
+title: Allow Pseudonymizer to write to a bucket without having permissions to see
+  all buckets
+merge_request: 6682
+author:
+type: fixed

ee/lib/pseudonymizer/uploader.rb

@@ -84,7 +84,7 @@ module Pseudonymizer
       if connection.service == ::Fog::Storage::Local
         connection.directories.create(key: @remote_dir)
       else
-        connection.directories.get(@remote_dir)
+        connection.directories.new(key: @remote_dir)
       end
     end