Studio: course outline revised styling with reference templates
Integrate visual styling into the course outline
Studio: outline UI revisions:

* syncing up unit publishing state UI with stateful names/styles
* revising outline item status message display logic to show release status
* fixing publishState value typo in outline UI template
* refining and syncing incontext editor styling
* maintaining visual alignment of collapsed/expanded sections in outline UI
* simplifying page-level action styles on outline UI
Fix most bokchoy tests
Apply code review comments and fix tests
Correct publish titles, code review feedback.
Studio: addressing outline UI PR feedback:

* correcting visual display of outline UI without content
* temporarily resolving page actions that should be hidden by default
Add test fixes and fix expand collapse behavior
Stop propagation of clicks in XBlockStringFieldEditor
Fix collapsed subsections expanding when creating or deleting subsections
Prevent clicking in display name textbox from toggling expand collapse
Add test for published title when not live
Studio: further outline UI revisions + PR feedback

* syncing up status-release hover states for outline units
* adjusting in-context editor UI for longer outline titles
* corrects outline incontext editor display regression
* cleaning up unit/container sidebar styling
* removing redundant margin on Outline UI subsections
* selecting text when a user focuses into an incontext-editor input - STUD-2032
Include edited/published_by for container page only
Add tests for course outline warning messages

Fix failing bokchoy tests
Merge pull request #4549 from edx/andya/integrate-visual-styling-2

Integrate visual styling into the course outline