[chore](github) Optimize the workflow FE Code Style Checker (#14751)

We can reduce the times of checking out the codebase to boost the performance of the workflow.

.github/workflows/checkstyle.yaml

@@ -17,45 +17,39 @@
 #
 ---
 name: FE Code Style Checker
+
 on:
   pull_request:
+
 jobs:
-  changes:
-    name: Detect Changes
+  java-checkstyle:
+    name: "CheckStyle"
     runs-on: ubuntu-latest
-    outputs:
-      broker_changes: ${{ steps.filter.outputs.broker_changes }}
-      docs_changes: ${{ steps.filter.outputs.docs_changes }}
     steps:
-      - name: Checkout ${{ github.ref }}
+      - name: Checkout
         uses: actions/checkout@v3
         with:
           persist-credentials: false
           submodules: recursive
 
-      - name: Paths filter
+      - name: Paths Filter
         uses: ./.github/actions/paths-filter
         id: filter
         with:
           filters: |
             fe_changes:
               - 'fe/**'
-  java-checkstyle:
-    name: "CheckStyle"
-    needs: changes
-    if: ${{ needs.changes.outputs.fe_changes == 'true' }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
-        uses: actions/checkout@v2
-        with:
-          persist-credentials: false
-          submodules: recursive
+              - 'gensrc/proto/**'
+              - 'gensrc/thrift/**'
+
       - name: Setup Maven Action
+        if: steps.filter.outputs.fe_changes == 'true'
         uses: ./.github/actions/setup-maven
         with:
           maven-version: 3.8.4
+
       - name: Run java checkstyle
+        if: steps.filter.outputs.fe_changes == 'true'
         run:
           cd fe && mvn clean checkstyle:check