[Extensions c2s] Reimplement tests for ExtensionsMenuAccessControl(10/n)

A new extensions toolbar and menu is being implemented under feature flag kExtensionsMenuAccessControl (crbug.com/40879945). To enable this
feature, we need to re-implement tests that verify existent extensions
toolbar functionality. We don't parameterize the existent test because
the UI is different and we can use a better test framework (kombucha).

This CL re-implements from ExtensionsMenuViewInteractiveUITest in ExtensionsMenuMainPageViewInteractiveTest:
  - MenuGetsUpdatedAfterSiteAccessChanges

Bug: 373672171
Change-Id: I4102688da8a188815aca1ee3845ccbb73c321ed5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5980803
Commit-Queue: Emilia Paz <emiliapaz@chromium.org>
Reviewed-by: Tim <tjudkins@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1399233}