fix: remove interaction events registration from bendpoints

[barmac]

Proposed Changes

The PR removes interaction events registration and unregistration from the bendpoints module. This is already handled directly in the interaction events, and we do not want to unregister.

Try out via

npx @bpmn-io/sr bpmn-io/bpmn-js -l bpmn-io/diagram-js#965-remove-interaction-events-registration

Closes #965

Checklist

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[nikku]

For performance reasons we originally registered mouse move only when needed; but apparently today, we register it (and emit it) per default. So this feature, indeed, is legacy.

I could only spot a longer standing floating bendpoint glitch; otherwise this works "as expected":