drop a list-changed step whose answer nothing reads

`ct list-changed` diffs against ct 2.3.1's default target branch, master, which
this repo does not have — git exits 128 and the step takes the job with it. It
set `steps.list-changed.outputs.changed`, and no step references it: the two
that follow are `ct lint --all` and `ct install --all`, already scoped by
--chart-dirs. So the step's only effect was to fail.

.hanzo/workflows/helm_ci.yaml

@@ -39,14 +39,6 @@ jobs:
       - name: Set up chart-testing
         uses: helm/[email protected]
 
-      - name: Run chart-testing (list-changed)
-        id: list-changed
-        run: |
-          changed=$(ct list-changed --chart-dirs deploy/helm/s3-csi/)
-          if [[ -n "$changed" ]]; then
-            echo "::set-output name=changed::true"
-          fi
-
       - name: Check if Chart version was updated
         if: github.event_name == 'pull_request'
         run: |