Following up on Jon's POC, this will get rid of the talk board component in
favor of linking to the server rendered talk page.
Additional Changes:
* Cleaned up talk selenium tests. Removed talk_steps.rb which doesn't appear
to be used anymore.
* Changed talk add button classes to a single class
* Moved "Add discussion" button to postheadinghtml per design mock
* Added "...talk-explained", "...talk-explained-empty" messages to
postheadinghtml per design mock
* Due to undesirable jumps in window scroll caused by the section anchor
& Toggler.js code when opening the TalkSectionOverlay (read fixme in
code), a Promise is always returned from OverlayManager route to reset
the scroll position to the top when the section overlay is opened.
* Moved
"mobile-frontend-talk-fullpage",
"mobile-frontend-talk-reply-success",
"mobile-frontend-talk-topic-feedback",
"mobile-frontend-talk-explained"
"mobile-frontend-talk-explained-empty"
messages to minerva as minerva is
the one who initiates those messages now.
* Limited $talk selector to only `.talk` elements since amc talk tab
does not need to be targeted
* After saving a reply from TalkSectionOverlay, the DOM that is not
part of the overlay becomes out of sync since a new reply was created.
To get around this, an `onSaveComplete` callback was passed (similar to
the TalkSectionAddOverlay) to execute a full page refresh. Although this
is clunky, it is the easiest way to resync.
Bug: T230695
Depends-On: I80201394fd7015db6700446142b0b4b20829f12e
Change-Id: I243f1193bce0da9fa710fc3b5379f90b2d079680
