Build metrics-reporter-jmx separately for stable-2.14

Core Gerrit stable-2.15 and later uses a newer version of
metrics-core.

Change-Id: I4fb4542f3b1282d1090b7c438c5a2cbeec821990
diff --git a/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-jmx.yaml b/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-jmx.yaml
index fafd681..49723b5 100644
--- a/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-jmx.yaml
+++ b/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-jmx.yaml
@@ -4,6 +4,9 @@
       - 'plugin-{name}-{branch}':
           branch:
             - stable-2.13
+      - 'plugin-{name}-bazel-{branch}':
+          branch:
+            - stable-2.14
       - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
@@ -12,4 +15,3 @@
             - stable-3.0
             - stable-2.16
             - stable-2.15
-            - stable-2.14