Use otelbot-java-instrumentation for metadata update workflow (#15555)

Author: trask

.github/workflows/metadata-update.yml

@@ -21,7 +21,15 @@ jobs:
       pull-requests: write # for adding label and assignee to PR
 
     steps:
+      - uses: actions/create-github-app-token@7e473efe3cb98aa54f8d4bac15400b15fad77d94 # v2.2.0
+        id: otelbot-token
+        with:
+          app-id: ${{ secrets.OTELBOT_JAVA_INSTRUMENTATION_APP_ID }}
+          private-key: ${{ secrets.OTELBOT_JAVA_INSTRUMENTATION_PRIVATE_KEY }}
+
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
+        with:
+          token: ${{ steps.otelbot-token.outputs.token }}
 
       - name: Free disk space
         run: .github/scripts/gha-free-disk-space.sh
@@ -55,27 +63,16 @@ jobs:
         if: steps.diffcheck.outputs.has_diff == 'true'
         run: .github/scripts/use-cla-approved-bot.sh
 
-      - uses: actions/create-github-app-token@7e473efe3cb98aa54f8d4bac15400b15fad77d94 # v2.2.0
-        if: steps.diffcheck.outputs.has_diff == 'true'
-        id: otelbot-token
-        with:
-          app-id: ${{ vars.OTELBOT_APP_ID }}
-          private-key: ${{ secrets.OTELBOT_PRIVATE_KEY }}
-
       - name: Find or create metadata update branch
         if: steps.diffcheck.outputs.has_diff == 'true'
         id: findbranch
-        env:
-          GH_TOKEN: ${{ steps.otelbot-token.outputs.token }}
         run: |
           BRANCH_NAME="otelbot/metadata-update-main"
           echo "branch=$BRANCH_NAME" >> $GITHUB_OUTPUT
           git checkout -B "$BRANCH_NAME"
 
       - name: Commit and push changes
         if: steps.diffcheck.outputs.has_diff == 'true'
-        env:
-          GH_TOKEN: ${{ steps.otelbot-token.outputs.token }}
         run: |
           BRANCH_NAME="${{ steps.findbranch.outputs.branch }}"
           git commit -m "chore: update instrumentation list [automated]" || echo "No changes to commit."
@@ -104,7 +101,7 @@ jobs:
       - name: Add label to PR
         if: steps.createpr.outputs.new_pr == 'true'
         env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ steps.otelbot-token.outputs.token }}
         run: |
           BRANCH_NAME="${{ steps.findbranch.outputs.branch }}"
           PR_URL=$(gh pr list --state open --head "$BRANCH_NAME" --json url -q '.[0].url')