Improve debug log

The two logs were consolidated into one, and the wording was improved.
Quotes were added around the variables to make it clearer in the case
where they are empty.

.github/workflows/wait-for-circleci-workflow-status.yml

@@ -18,9 +18,8 @@ jobs:
           # HEAD commit hash is `pull_request.head.sha`.
           HEAD_COMMIT_HASH: ${{ github.event.pull_request.head.sha || github.sha }}
         run: |
-          echo "Looking for pipeline for commit ${HEAD_COMMIT_HASH}"
           pipeline_id=$(curl --silent "https://circleci.com/api/v2/project/gh/$OWNER/$REPOSITORY/pipeline?branch=$BRANCH" | jq -r ".items | map(select(.vcs.revision == \"${HEAD_COMMIT_HASH}\" )) | first | .id")
-          echo "Found pipeline ID ${pipeline_id}"
+          echo "Waiting for pipeline '${pipeline_id}' for commit hash '${HEAD_COMMIT_HASH}'"
           workflow_status=$(curl --silent "https://circleci.com/api/v2/pipeline/$pipeline_id/workflow" | jq -r ".items[0].status")
 
           if [ "$workflow_status" == "running" ]; then