Add data tracking for editors

What does this MR do and why?

Add data tracking for editors (plain text and rich text)

Here's the outline of what and where we track things.

Label	Action	editorType	context
editor_tracking	editor_type_used	editor_type_plain_text_editor	See table below
		editor_type_rich_text_editor

Contexts

Area	context	Explanation
Issues	Issue	Creating or editing an issue
	Issue_comment	Comment on an issue
	Issue_note	Reply to a comment on an issue
Merge Requests	MergeRequest	Creating or editing an MR
	MergeRequest_comment	Comment on an MR
	MergeRequest_note	Reply to a diff or a comment on an MR
	MergeRequest_review	Sending a final message in a batch review
Epics	Epic	Creating on editing an epic
	Epic_comment	Comment on an epic
	Epic_note	Reply to a comment on an epic
Wiki	Wiki	Creating or editing a wiki page
Design	Design	Adding description to a design

Screenshots or screen recordings

No visual change.

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.

Related to #412699 (closed)