Revert "ci: use built-in token for team-memory queue" (#1944)

This reverts commit ebdddcf (#1943). Restore the Java Pack-scoped App token because the source GITHUB_TOKEN cannot dispatch workflows across repositories.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: chagong

.github/workflows/team-memory-post-merge.yml

@@ -23,14 +23,22 @@ jobs:
           github.event.forced == false }}
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    permissions:
-      contents: read
-      actions: write
     steps:
+      - name: Get token for the Java Pack coordinator
+        id: dispatch-token
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        with:
+          client-id: ${{ vars.ISSUELENS_DISPATCH_APP_CLIENT_ID }}
+          private-key: ${{ secrets.ISSUELENS_DISPATCH_APP_PRIVATE_KEY }}
+          owner: microsoft
+          repositories: vscode-java-pack
+          permission-contents: read
+          permission-actions: write
+
       - name: Queue team-memory request
         uses: microsoft/IssueLens/.github/actions/queue-team-memory@a81d2d96167fc0e69ac631c2edc85f858e693289
         with:
-          dispatch-token: ${{ github.token }}
+          dispatch-token: ${{ steps.dispatch-token.outputs.token }}
           coordinator-repository: microsoft/vscode-java-pack
           coordinator-workflow: team-memory-coordinator.yml
           coordinator-ref: main