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	✅	✅	✅	❌?

[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.