Use the renderStacktrace prop to render the stacktrace in Error reps

[nchevobbe]

In Bug 1390768, we want to use debugger's Frames component to render stacktraces in the console.
We also want to be able to use the same component that we will create there for Errors as well.
This means that in the Error rep, if a renderStacktrace prop is passed, it should be used to render the stacktrace.
if it is not passed, then we should default to the current rendering.

[nchevobbe]

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