Work item threads/comments - make add actions appear as inputs

What does this MR do and why?

Closes Work item threads/comments - make add actions a... (#393976 - closed).

Scope of changes :

• WI thread reply button -> textarea
• Ability to close/reopen issue from the main/fresh comment
• Fresh comment always available in edit mode

Screenshots or screen recordings

Fresh comment

Before(Fresh comment)	After(Fresh comment)

Reply to a thread , default , isEditing false

Before(reply to thread)	After(reply to thread)

Reply to a thread , triggered click/focus , isEditing true

Before(reply to thread)	After(reply to thread)

Detailed screenshots

header	header
total padding 16px
Button label for replies should be "Reply", not "Comment" (new comments, not in thread, remain comment)
Reply focus ring should not be cut off in any mode	.
Clicking the "Reply" button should automatically focus the editor, currently shows the editor but does not focus	Screen_Recording_2023-04-04_at_11.51.30_AM
Distance should be 16px margin between last item and comment form

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Open any work item -> task , objective or key result
2. Try to add a fresh comment / reply to threads and see the visual difference

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.