[PWA/Navigation Capturing] Clean up dependencies to browser_navigator.cc

This CL cleans up the web app navigation handling code so that there are
less dependencies on browser_navigator.cc, and most of the use-cases
are handled in the web_apps layer. This is done by:
1. Returning an AppNavigationResult for all navigations when it was
earlier just returned for navigations handled by the web app system.
2. Always having a NavigationCapturingRedirectionInfo populated in
the navigation result so that data inside can be collected at all
stages of navigation handling.
3. Adding a new first_navigation_app_id field that is populated
whenever an app window is created by the handling code, which will
be useful for handling redirection.

Tested by running the existing NavigationCapturingDataTransfer browser
tests and adding a new test that verifies that aux clicks do not
enqueue redirection handling info, which is the expected behavior.

Bug: 351775835, 359869845
Change-Id: I38c3424fc95f23e581fdfde3ea8ab0f373c633c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5902502
Reviewed-by: Mike Wasserman <msw@chromium.org>
Commit-Queue: Dibyajyoti Pal <dibyapal@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1363327}