Add descriptive name to size deltas report step

The `name` key of a GitHub Actions workflow step is used to define the name used to identify that step to humans. When
one is not defined, a more cryptic name is generated from the machine readable content of the step. A descriptive name
will make it easier to understand the workflow run logs.

Author: per1234

.github/workflows/compile-examples.yml

@@ -120,7 +120,8 @@ jobs:
           name: ${{ env.SKETCHES_REPORTS_ARTIFACT_NAME }}
           path: ${{ env.SKETCHES_REPORTS_PATH }}
 
-      - uses: arduino/report-size-deltas@v1
+      - name: Comment size deltas report to PR
+        uses: arduino/report-size-deltas@v1
         # If actions/download-artifact failed, there are no artifacts to report from.
         if: steps.download-artifact.outcome == 'success'
         with: