fix(ci): include commit SHA in fallback E2E label-help comment

When the workflow runs lookup returns no specific run id, the comment
now tells the maintainer to find the run by commit SHA on the workflow
page instead of just linking to the all-runs page with no further
guidance.

Signed-off-by: Piotr Mlocek <pmlocek@nvidia.com>

Author: pimlock

.github/workflows/e2e-label-help.yml

@@ -56,11 +56,12 @@ jobs:
             run_id=$(gh api "repos/$GH_REPO/actions/workflows/$workflow_file/runs?head_sha=$PR_HEAD_SHA&event=push" \
               --jq '.workflow_runs | sort_by(.created_at) | reverse | .[0].id // empty')
             if [ -n "$run_id" ]; then
-              run_link="[the existing run](https://github.com/$GH_REPO/actions/runs/$run_id)"
+              instructions="Open [the existing run](https://github.com/$GH_REPO/actions/runs/$run_id) and click **Re-run all jobs** to execute with the label set."
             else
-              run_link="[$workflow_name](https://github.com/$GH_REPO/actions/workflows/$workflow_file)"
+              workflow_link="[$workflow_name](https://github.com/$GH_REPO/actions/workflows/$workflow_file)"
+              instructions="Open $workflow_link, find the run for commit \`$short_pr\`, and click **Re-run all jobs** to execute with the label set."
             fi
-            body="Label \`$LABEL_NAME\` applied for \`$short_pr\`. Open $run_link and click **Re-run all jobs** to execute with the label set. The \`E2E Gate\` check on this PR will flip green automatically once the run finishes."
+            body="Label \`$LABEL_NAME\` applied for \`$short_pr\`. $instructions The \`E2E Gate\` check on this PR will flip green automatically once the run finishes."
           fi
 
           gh pr comment "$PR_NUMBER" --body "$body"