Reland "[iOS][media-permissions] Add inttest for permissions"

This is a reland of commit e9d9ec8ec240f70d1052645e924f98af5cfdfd7d
and commit 6dcaa3902f078cf19d52bef498dbf92eb4d79783

Disabling test on real devices as it would wait for a user to respond
to "ios_web_inttests Would Like to Access the Camera" prompt. This
is not supported by gtest. Related logic and behaviors would be tested
on real devices in egtests.

Original change's description:
> [iOS][media-permissions] Add inttest for permissions
>
> This CL adds architecture for media permissions inttests.
>
> 1. Test pages that these tests should be used are added
> 2. Adds mock objects that overrides default WKUIDelegate and observer
> behaviors
> 3. Adds tests for the permissions observer in web state observer
>
> Bug: 1284709
> Change-Id: Idac8b3fcf4241cce4991334a4fc22d9d5eb3bff6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3499124
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#978674}

Bug: 1284709
Change-Id: I961eccc85df8a12521a7b5683aa54c06acb23708
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3514556
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Ginny Huang <ginnyhuang@chromium.org>
Auto-Submit: Ginny Huang <ginnyhuang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#979779}