test(wasi): enable absolute symlink tests

[kkebo]

No description provided.

[kkebo]

Features we need:

1. symlink() can create absolute symlinks
2. readlink() can read absolute symlinks
3. readdir() can return absolute symlinks
4. call stack size can be increased

Runtimes comparison:

	wasmtime	Wasmer	WasmKit	WasmEdge
1. symlink()	❌ (relative only)	❌ (relative only)	✅	❌?
2. readlink()	❌ (relative only)	❌ (relative only)	❌ ✅	✅
3. readdir()	✅	❌ (relative only)	✅	✅
4. call stack size	✅	✅	✅	❌?

Related issues:

• wasmtime symlink resolution policy may be too strict bytecodealliance/wasmtime#6227
• readdir() can't return absolute symlinks wasmerio/wasmer#5143
• [WASI] path_readlink swiftwasm/WasmKit#228

[kkebo]

I'm going to create another PR #116 to enable relative symlink tests while leaving absolute symlink tests disabled. This PR will focus on absolute symlink tests.

[kkebo]

I've confirmed that all tests successfully passed when executed on the latest WasmKit. 🎉

[kkebo]

Now the Tests/ differences between upstream/main and enable-symlnk-tests are almost zero.

diff --git a/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift b/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
index 1727c52..3c70593 100644
--- a/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
+++ b/Tests/SwiftFormatTests/Utilities/FileIteratorTests.swift
@@ -69,6 +69,12 @@ final class FileIteratorTests: XCTestCase {
   }
 
   override func tearDownWithError() throws {
+    #if os(WASI)  // https://github.com/swiftlang/swift-foundation/pull/1786
+    let iter = FileManager.default.enumerator(at: tmpdir, includingPropertiesForKeys: nil)!
+    for url in iter.reversed().compactMap({ $0 as? URL }) {
+      try FileManager.default.removeItem(at: url)
+    }
+    #endif
     try FileManager.default.removeItem(at: tmpdir)
   }

[kkebo]

This PR should revert 3725ed5 too.