Resolve "Draggable comment icon for multiline comment broken on Firefox"

What does this MR do?

Due to a bug in Firefox buttons are not draggable: https://bugzilla.mozilla.org/show_bug.cgi?id=568313

This changes the button to a div and uses "role" to keep the semantics for ARIA

Screenshots (strongly suggested)

Before	After
Screen_Recording_2021-04-06_at_9.49.45_AM	Screen_Recording_2021-04-06_at_1.04.33_PM

Does this MR meet the acceptance criteria?

Conformity

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Related to #327013 (closed)