Improve json linter log readability #39597
Merged
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Summary
SUMMARY: Build "makes json linter feedback more readable"
Purpose of change
Personal peeve: "Unformatted" always sounds to me like "this file is not formatted correctly". Also inconsistency in positioning of the filename made it harder to scan the log for problems.
Describe the solution
Screenshot:
![Screenshot from 2020-04-15 15-24-56](https://user-images.githubusercontent.com/523439/79395271-1bcf1200-7f2e-11ea-9165-c6c7a9677ebb.png)
Describe alternatives you've considered
Dealing with it.
Testing
Messed up the formatting in a file & ran
make style-json
Additional context
This may be a shitty/clumsy/non-cross-platform way to do this (I don't know if the isatty check works in windows/macos/whatever, or at all). If there's a better way let me know and I'll fix it.