Fix (graphiql) to allow editor overrides for unwanted behaviors

[lesleydreyer]

This allows users to customize the editor options further.

I wasn't sure if it would be ok to edit the options, but if it is I think adding at minimum the scrollbar change to the list of options would be good, but figured should wait for reviewer feedback

- scrollbar: { alwaysConsumeMouseWheel: false }
- suggest: { showWords: false }
- hover: { above: false }

closes #4163 and possibly #4142

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