ci(docs-infra): increase wait for SW on localhost to avoid CI flakes (#29953)

The server used for testing on localhost has less optimizations (e.g.
serves uncompressed files), so we need to wait longer the ServiceWorker
to be loaded and registered to allow Lighthouse to reliably detect it,
especially on slower environments (e.g. CI).

Related: https://github.com/GoogleChrome/lighthouse/issues/5527#issuecomment-483710849

Fixes #29910

PR Close #29953

.circleci/config.yml

@@ -249,10 +249,7 @@ jobs:
       - run: yarn --cwd aio lint
         # Run PWA-score tests
         # (Run before unit and e2e tests, which destroy the `dist/` directory.)
-        # Temporarily lowering the min required PWA score to avoid flakes on CI.
-        # TODO(gkalpak): Re-enable once https://github.com/angular/angular/issues/29910 is resolved.
-      # - run: yarn --cwd aio test-pwa-score-localhost $CI_AIO_MIN_PWA_SCORE
-      - run: yarn --cwd aio test-pwa-score-localhost 70
+      - run: yarn --cwd aio test-pwa-score-localhost $CI_AIO_MIN_PWA_SCORE
         # Check the bundle sizes.
         # (Run before unit and e2e tests, which destroy the `dist/` directory.)
       - run: yarn --cwd aio payload-size
@@ -287,10 +284,7 @@ jobs:
       - run: yarn --cwd aio build-local --progress=false
         # Run PWA-score tests
         # (Run before unit and e2e tests, which destroy the `dist/` directory.)
-        # Temporarily lowering the min required PWA score to avoid flakes on CI.
-        # TODO(gkalpak): Re-enable once https://github.com/angular/angular/issues/29910 is resolved.
-      # - run: yarn --cwd aio test-pwa-score-localhost $CI_AIO_MIN_PWA_SCORE
-      - run: yarn --cwd aio test-pwa-score-localhost 70
+      - run: yarn --cwd aio test-pwa-score-localhost $CI_AIO_MIN_PWA_SCORE
         # Run unit tests
       - run: yarn --cwd aio test --progress=false --watch=false
         # Run e2e tests