Refactor `open` action in `ide/stores/modules/pane/actions.js` to just take `name` instead of `view`

References: !21010 (closed)

Refactor open action in ide/stores/modules/pane/actions.js to just take name instead of view. This will simplify many calls and specs, and be more aligned with how the views are tracked in the state (which just stores the name of the view).

E.g., look up the view based on name with something like const view = _.findWhere(_.values(leftSidebarViews), { name });, but for both sidebars.