Prepend `SyntaxStringInterpolationError` errors in macro expansion with `Internal macro error:`#2176

ahoppen merged 2 commits intoswiftlang:mainswiftlang/swift-syntax:mainfrom

natikgadzhi:macro-expansion/syntax-interpolation-errorsnatikgadzhi/swift-syntax:macro-expansion/syntax-interpolation-errorsCopy head branch name to clipboard