Hides award emoji & access level on system notes
## What does this MR do?
Hides award emoji & access level on system notes as they aren't applicable to them notes.
## Screenshots (if relevant)

See merge request !4629
Fixed alignment of buttons in note forms
## What does this MR do?
Due to a CSS change on some buttons, the alignment of the save button on the note form went off. Also, it made no sense to have `.btn-grouped` as the button wasn't in a group.
## Screenshots (if relevant)


See merge request !4740
Shows the edit comment button on mobile
## What does this MR do?
Shows the edit comment button on mobile.
## What are the relevant issue numbers?
Closes#17214
## Screenshots (if relevant)

See merge request !4402
Discussion notes update
- At the moment discussion notes are rendered in a list but arent actually a list item and that can cause overflow issues
- Moved the dates to be in the header like other notes
- Fixed overlapping issue on mobile
See merge request !3720
At the moment discussion notes are rendered in a list but arent actually a list item and that can cause overflow issues
Moved the dates to be in the header like other notes
Fixed overlapping issue on mobile
Updated the JS to have a standard class with standard actions for each form
Created ability to have toolbar buttons that insert different prefixes dependant upon the data-prefix attribute
Fixed issue with member access not being visible on notes
This happened because the `note-actions`, which houses the access, was wrapped in a `can_edit` if statement

Fixes#15049
See merge request !3618
Added discard button to comment form
Also changed the labels on the buttons to better match the action they are completing.
Closes#8057
See merge request !3085