Intents: Move ArcIntentHelper filtering to ArcExternalProtocolDialog

We currently filter the ArcIntentHelper package out from the intent
picker to prevent it from being shown. This moves the filtering up to
ArcExternalProtocolDialog, which is the business logic which controls
which apps to show in that dialog.

Note that the Intent Picker can also be shown for link intents by code
in IntentPickerTabHelper. This code path cannot show ArcIntentHelper in
the dialog, as IntentPickerTabHelper pulls apps from App Service, and
ArcIntentHelper does not publish Intents to App Service.

Bug: 1321501
Test: Install an Android app which handles all http/https Intents (e.g.
a browser app), then click a intent:// link in Chrome like
intent://google.com#Intent;scheme=https;end. The intent picker should
open with only the browser app in the list, and the 'Stay in chrome'
button visible.

Change-Id: I1e6d7c652ac2b8caf931ad4cf69828afbb89da35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3621654
Commit-Queue: Tim Sergeant <tsergeant@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1001874}