ci(e2e): re-enable e2e tests

I've removed the coverage upload bit, since although the
[@cypress/code-coverage][1] plugin is pretty easy to setup,
it requires babel, which we're about to remove and replace
with ESBuild.

.github/workflows/e2e.yml

@@ -36,9 +36,3 @@ jobs:
         run: yarn e2e
         env:
           CYPRESS_CACHE_FOLDER: .cache/Cypress
-
-      - name: Upload Coverage to Coveralls
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          flag-name: e2e