Same for service-is-removed.js

It would be nice if these things were shared.  Maybe we can address this when we move to web platform tests?

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+odejesush@ since they've been working on the WPT migration.

I can definitely add more characteristic methods, then convert and migrate the service-is-removed.js tests. The device-out-of-range.js might require the scanning API to be implement, or it could be simulated with a method like setNextGATTConnectionResponse/setNextGATTDiscoveryResponse. I'll have to ask Giovanni about that.