TEST PLAN:
$ bazel build release
Install bazel-bin/release.war and verify that the versions of the
core plugins are reported correctly:
commit-message-length-validator: v2.13.1-2-g76b911
download-commands: v2.13.2-5-gd632d64
hooks: v2.13.2-7-gf27c7e7
replication: v2.13.2-17-g531ed1
reviewnotes: v2.13.1-7-g45f6975
Change-Id: Iaceeeb1daafd7455c8d8a3673682d1ab9e65d8ef