Some parens fixes

[brianrourkeboll]

This pulls in some code-fix-level fixes from https://github.com/dotnet/fsharp/pull/16901 (I meant to do this a while ago).

• Keep parens around outlaw match exprs (where the first | is leftward of the start of the match keyword).
• Ignore single-line comments when determining offsides lines.
• Don't add a space when removing parens when doing so would result in reparsing an infix op as a prefix op.