Fix #7403: Fix ServerTrust notification to update the URL bar

[Brandon-T]

Summary of Changes

• Server Trust does not post a notification if the trust itself hasn't changed. Problem is that the trust on NTP is the same as on an HTTP site. So visiting an HTTP site takes the same trust as on NTP, which is wrong. To fix this, we post a notification ourselves to let us know that the URL changed but the trust stayed the same.
  This in turn causes the revalidation to happen.

This pull request fixes #7403

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()
• New or updated UI has been tested across:
  • Light & dark mode
  • Different size classes (iPhone, landscape, iPad)
  • Different dynamic type sizes

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).