Execute plugin-manager tests

Run plugin-manager tests during the CI build

Change-Id: Ib5bfbd6cf8f1af52eebc618a68e4678b46d7e000
diff --git a/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml b/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
index b02154f..5e46c05 100644
--- a/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-plugin-manager.yaml
@@ -1,5 +1,6 @@
 - project:
     name: plugin-manager
+    targets: 'plugins/plugin-manager plugins/plugin-manager:plugin_manager_tests'
     jobs:
       - 'plugin-{name}-{branch}':
           branch: