Update title view and subscribe button layout based on authentication status

[staykids]

Phabricator: https://phabricator.wikimedia.org/T310275 (partially)

Notes

This PR updates the layout of the talk page cell depending on whether the user is logged in or logged out. See the test steps below.

Test Steps

1. While logged out, visit a talk page and confirm the subscribe button does not appear, and that the title view is displayed to the next to the disclosure button.
2. While logged in, visit a talk page and confirm the subscribe button appears next to the disclosure button, and that the title view is displayed below this row.

Screenshots/Videos

• Logged out:

• Logged in: