fix(cli): pass in parser to prettier format to avoid deprecation warning

[mikaelbr]

Summary

Prettier now gives warning when not being able to infer correct parser for files. It can infer by checking filepath or when explicitly setting parser. See issue and comment: prettier/prettier#4763 (comment)

This causes outputs such as:

There are different ways to solve this:

1. Pass in filename and let parser be inferred in format.
2. Fetch inferred parser and pass in explicit parser to format.

In this PR I've chosen the latter option as it feels more explicit. In plugin-prettier it is hardcoded to babel but as I see it that might not be correct here?

Test plan

Tested by running and verifying that prettier deprecation warning is gone.

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[gregberge]

Need to be in a Promise.all

[mikaelbr]

Did some more digging in the prettier source code. getFileInfo ends up using resolveConfig again and inferring based on filepath. So to avoid extra work (and extra IO) it's better to just pass in file path as an option. Updated the code and verified by running the CLI.