Incorrect absoluteString for URL on linux

[Jomy10]

Description

URL(fileURLWithPath: "images", isDirectory: true).absoluteString returns file:///home/..../images

This is a problem because when running FileManager.default.contentsOfDirectory(atPath: url.absoluteString) for example, it will throw an error saying the file does not exist.

Reproduction

let url = URL(fileURLWithPath: "images", isDirectory: true)
print("absoluteString: \(url.absoluteString)")
do {
  try FileManager.default.contentsOfDirectory(atPath: url.absoluteString)
} catch {
  print("error: \(error)"
}

Expected behavior

absoluteString should return /home/..../images, not file:///home/..../images

Environment

Swift version 5.10 (swift-5.10-RELEASE)
Target: aarch64-unknown-linux-gnu

Additional information

No response

[AnthonyLatsis]

@xedin Please transfer this to corelibs-foundation.