tests: Include spaces in temporary build directory paths

This helps to detect Shell.run() calls which do not quote path names appropriately.

Author: euanh

Tests/SwiftSDKGeneratorTests/EndToEndTests.swift

@@ -32,7 +32,8 @@ extension FileManager {
     // https://github.com/swiftlang/swift-corelibs-foundation/blob/21b3196b33a64d53a0989881fc9a486227b4a316/Sources/Foundation/FileManager.swift#L152
     var logger = logger
 
-    let temporaryDirectory = self.temporaryDirectory.appendingPathComponent(UUID().uuidString)
+    // Include spaces in the temporary directory name to help detect Shell.run() calls which do not quote path names appropriately
+    let temporaryDirectory = self.temporaryDirectory.appendingPathComponent("\(UUID().uuidString) with spaces")
     logger[metadataKey: "temporaryDirectory"] = "\(temporaryDirectory.path)"
 
     try createDirectory(at: temporaryDirectory, withIntermediateDirectories: false)