This commit is focused on incorporating cli/go-gh accessible colors configuration setting into GitHub CLI experience along with new color function to supersede ColorScheme.Gray and ColorScheme.Grayf.
Originally, I was considering having all use of ColorScheme.Gray and ColorScheme.Grayf fallback to the new muted logic if accessible colors were enabled, however I decided not being that it exceeds the acceptance criteria. This means that every command using ColorScheme.Gray needs to be updated to use ColorScheme.Muted
