TNL-6184

Fix read only support for team discussions

Fix error messages to use "posts" not "threads"

More small UI tweaks, padding and alignment

Add a11y tests for all inline discussion states

Improve discussion error messages

Make this selector more specific, was getting overrides

Fix Teams implementation of inline discussion

Fix LMS tests

Work on pagination support

Jasmine tests for this feature

Focus works when navigating between list and detail

Fix safe template violations

This reverts commit d39f7197.

TNL-4756

TNL-4709

TNL-5166

TNL-4640

TNL-5163

TNL-5161

TNL-4557

TNL-4622

Discussion forum styling cleanup to correct current visual styling issues in addition to cleaning up styles in preparation  for adding post images

This is a squash of 38 commits ending with
5b080f979d692804452400ac5bed9b17c50b001e

updated inline discussion styling to account for lack of expand / show message (which was being relied on for layout) and also removed issues of generic pagination styling impacting the older inline discussion pagination pattern with a class renaming

* updating vendor files
* updating class syntax (to new FA-based classes) for all UI elements
* correcting broken tests

SASS compilation variable conventions update, focusing on basic colors, baseline variable usage for padding and margins, ui-depth extends, along with other small fixes. The intent with this is to not have any user-facing impact, and instead move us closer toward having files that use our newer sass conventions.