Add CI to detect stale vis screenshots (#33274)

* Add CI to detect stale vis screenshots

* Remove already installed `tree` command

* Remove workaround for vis silently adding missing screenshots in CI

* Fix stale screenshot detection

* Test that CI doesn't silently create new screenshots

* Discard changes to packages/shared-components/src/room/composer/Banner/Banner.stories.tsx

* Delete stale snapshots

.github/workflows/shared-component-visual-tests-netlify.yaml

@@ -25,9 +25,6 @@ jobs:
             actions: read
             deployments: write
         steps:
-            - name: Install tree
-              run: "sudo apt-get install -y tree"
-
             - name: Download Diffs
               uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
               with: