Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Update web-component-tester to 6.5.1
  Add support for Elasticsearch version 7.6.*
  Error Prone: Enable and fix ClassCanBeStatic
  Write upload-pack metrics to sshd log

Change-Id: I533d5ca030b608399cc56e7905c9c5b6e6a994bc
tree: 24b01d11fed846c8bd9214ff1201a8982ad4ace5
  1. java/
  2. javatests/