[clang][ASTImporter] Fix friend class template import within dependent context

For friend class template within dependent context:

1. Should not do structure matching checking. This fixes importing failure of
   template with non-type parm;
2. Should not be added into redecls chain.

See Sema::CheckClassTemplate().

Fixes https://github.com/llvm/llvm-project/issues/64169.

Reviewed By: aaron.ballman, balazske, shafik

Differential Revision: https://reviews.llvm.org/D155661