Fix test bugs where the test will always pass for extension policies

- Replace old CWS URL with new CWS URL
- Use Google Translate instead of deprecated Google Hangout extension
- The new blocked extension behavior is an text banner

TESTED: Related tests still passing in https://ci.chromium.org/ui/p/chrome/builders/try/win-celab-try-rel/550/overview

Bug: 303846325
Change-Id: I750d90dc2c0e34e3feecc853581745dc310579ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6527972
Commit-Queue: Xiang Ji <jxiang@google.com>
Reviewed-by: Jonathan Lee <jonathanjlee@google.com>
Cr-Commit-Position: refs/heads/main@{#1458219}