feat: remove useless step

Signed-off-by: SuZhou-Joe <[email protected]>

.github/workflows/dashboards-notifications-test-and-build-workflow.yml

@@ -53,13 +53,6 @@ jobs:
           distribution: temurin # Temurin is a distribution of adoptium
           java-version: 11
 
-      - name: Checkout Plugin
-        uses: actions/checkout@v2
-        with:
-          path: notifications
-          repository: opensearch-project/notifications
-          ref: '2.x'
-
       # This is a hack, but this step creates a link to the X: mounted drive, which makes the path
       # short enough to work on Windows
       - name: Shorten Path