[KSP] Type variables in throws statement causes validation exception.

[bcorso]

Before processing an element (e.g. an @Inject-annotated constructor), Dagger validates that all types referenced in the element are valid (i.e. they exist on the class path).

However, when processing with Dagger's KSP processor we get an unexpected error when a method has a throws type that is a type variable (compared to Javac/KAPT where there is no error). For example:

class MyClass {
  // Dagger’s KSP processor will fail due to <ERROR TYPE> for type variable T.
  <T extends Throwable> void method() throws T {}
}

Fixing this issue is currently blocked by google/ksp#1460.