[Clang][Sema] Use the correct injected template arguments for partial specializations when collecting multi-level template argument lists (#112381)

After #111852 refactored multi-level template argument list collection,
the following results in a crash:
```
template<typename T, bool B>
struct A;

template<bool B>
struct A<int, B>
{
    void f() requires B;
};

template<bool B>
void A<int, B>::f() requires B { } // crash here
```

This happens because when collecting template arguments for constraint
normalization from a partial specialization, we incorrectly use the
template argument list of the partial specialization. We should be using
the template argument list of the _template-head_ (as defined in
[temp.arg.general] p2). Fixes #112222.

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