refactor: make CommentView more amenable to subclassing. #8783
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The basics
This PR makes
CommentViewmore compatible with subclassing. Scratch has a subclass, which it uses to provide a bubble-based comment view attached by a line to its parent block. This PR allows that subclass to implementISelectable, which requiresthis.workspaceto be public, and allows for it to correctly update its disposal state around additional disposal logic.