[nrf noup] ci: Fix manifest-pr-skip

fixup! [nrf noup] ci: Enable action-manifest-pr

When the PR title or body contains "manifest-pr-skip", this action will
cancel itself, which results in a failure status. Use the same condition
to skip the whole workflow instead.

Signed-off-by: Grzegorz Swiderski <[email protected]>

Author: 57300

.github/workflows/manifest-PR.yml

@@ -10,6 +10,8 @@ jobs:
   call-manifest-pr-action:
     runs-on: ubuntu-latest
     steps:
+      - name: test
+        run: echo ${{ github.event.pull_request.body }}
       - name: handle manifest PR
         uses: nrfconnect/action-manifest-pr@main
         with: