Add support for its-jira stable-3.9, 3.8, 3.7

Add support for its-jira stable-3.9, 3.8, 3.7, which now builds against
their own branches, that were added to the plugin

Bug: Issue 338871700
Change-Id: I21ea03b34374d448faf9caf9b03885d42a24fd9b
diff --git a/jenkins/gerrit-bazel-plugin-its-jira.yaml b/jenkins/gerrit-bazel-plugin-its-jira.yaml
index 822eec5..a7dc99c 100644
--- a/jenkins/gerrit-bazel-plugin-its-jira.yaml
+++ b/jenkins/gerrit-bazel-plugin-its-jira.yaml
@@ -1,15 +1,10 @@
 - project:
     name: jira
     jobs:
-      - 'plugin-its-{name}-bazel-{branch}-{gerrit-branch}':
-          branch:
-            - master
-          gerrit-branch:
-            - stable-3.9
-            - stable-3.8
-            - stable-3.7
-          targets: 'plugins/its-jira:its-jira plugins/its-jira:its_jira_tests'
       - 'plugin-its-{name}-bazel-{branch}':
           branch:
             - master
+            - stable-3.9
+            - stable-3.8
+            - stable-3.7
           targets: 'plugins/its-jira:its-jira plugins/its-jira:its_jira_tests'