[release/7.0] Implement proper File System detection for Apple OSes (#74560)

* the assert should fail on macOS

* Don't use statfs on Apple systems, as for them it returns version-specific file system ids.

* move mapping to a separate method and reuse it

* minor improvement

Co-authored-by: Adam Sitnik <adam.sitnik@gmail.com>
Co-authored-by: Adam Sitnik <adam.sitnik@microsoft.com>

Author: github-actions[bot]

src/libraries/Common/src/Interop/Unix/System.Native/Interop.UnixFileSystemTypes.cs

@@ -155,7 +155,7 @@ internal static bool TryGetFileSystemType(SafeFileHandle fd, out UnixFileSystemT
         {
             uint fstatfsResult = GetFileSystemType(fd);
             fileSystemType = (UnixFileSystemTypes)fstatfsResult;
-            Debug.Assert(Enum.IsDefined(fileSystemType) || fstatfsResult == 0 || !OperatingSystem.IsLinux(), $"GetFileSystemType returned {fstatfsResult}");
+            Debug.Assert(Enum.IsDefined(fileSystemType) || fstatfsResult == 0, $"GetFileSystemType returned {fstatfsResult}");
             return fstatfsResult != 0;
         }
     }