Remove pages publishing of webpack report

We are not consuming the webpack-report via pages anymore, it can be
found on:
https://gitlab-org.gitlab.io/frontend/playground/webpack-memory-metrics/last-report.html

We stopped consuming it as it's creation was unreliable as not _every_
pipeline runs the webpack compilation. Now it seems to be too large, so
let's just remove it.

.gitlab/ci/frontend.gitlab-ci.yml

@@ -235,6 +235,8 @@ coverage-frontend:
     - *yarn-install
   script:
     - run_timed_command "yarn node scripts/frontend/merge_coverage_frontend.js"
+    # Removing the individual coverage results, as we just merged them.
+    - rm -r coverage-frontend/jest-*
   coverage: '/^Statements\s*:\s*?(\d+(?:\.\d+)?)%/'
   artifacts:
     name: coverage-frontend

.gitlab/ci/pages.gitlab-ci.yml

@@ -14,7 +14,6 @@ pages:
     - mv coverage/ public/coverage-ruby/ || true
     - mv coverage-frontend/ public/coverage-frontend/ || true
     - mv coverage-javascript/ public/coverage-javascript/ || true
-    - mv webpack-report/ public/webpack-report/ || true
     - cp .public/assets/application-*.css public/application.css || true
     - cp .public/assets/application-*.css.gz public/application.css.gz || true
   artifacts: