Add support for toggling discussion filter from notes section

What does this MR do?

Adds a note style system-note under Notesapp which allows user to toggle discussion filter to show All activity or Comments only activity when user has selected History only activity from discussion filter dropdown.

Screenshots

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #51819 (closed), https://gitlab.com/gitlab-org/gitlab-ee/issues/7716