Allow CodeView to accept a single `file` prop instead of 3 individual props

[bobsilverberg]

This is a follow-up to https://github.com/mozilla/addons-code-manager/pull/1498.

CodeView accepts some props which are properties of a VersionFile. #1498 introduced yet another of those, the isMinified prop.

It seems like it might be better to just accept a file prop, and then destructure that inside the component in order to get the content, isMinified, and mimeType props. I investigated this during the development of #1498 but found that it complicated testing because we need to create a VersionFile in the test, and we don't currently have a way to do that. Introducing a way to do that would result in some refactoring of the versions reducer, and it all started to look like more work than would be worthwhile, at least to land #1498.

This is a code quality issue to look into doing that work so that CodeView can simply accept a file prop.

┆Issue is synchronized with this Jira Task

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