Disable Prettier if no prettier config exists (#3994)
Disable Prettier if no prettier config exists (#3994)

A lot of users of [prettier extension](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode) use it to format files automatically on save leading to unwanted diffs, so I've added an option to disable prettier unless there is a prettier config file.

Co-authored-by: Joey Robichaud <6f68694e8a3542624a1e70ed2a98b9e17bc04bc6@microsoft.com>
gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,gregg-miskelly/omnisharp-vscode