surface (fix): Fix opaque type reference for Scala 3.3.4

[xerial]

Resolves issues when upgrading to Scala 3.3.4

• Surface for nested opaque types
• Simplified a path-dependent type test, as path-dependent type is not frequently used, it should not be a blocker to use later versions of Scala. surface: Simplify extractSymbol - avoid .tree to make library working with Scala 3.4.2 #3533