clang-tidy: modernize-use-using removes const and volatile qualifiers

```cpp
typedef const int T;
typedef volatile int U;
```

```console
$ clang-tidy '--checks=-*,modernize-use-using' --fix a.cpp
2 warnings generated.
/tmp/a.cpp:1:1: warning: use 'using' instead of 'typedef' [modernize-use-using]
1 | typedef const int T;
| ^~~~~~~~~~~~~~~~~~~
| using T = int
/tmp/a.cpp:2:1: warning: use 'using' instead of 'typedef' [modernize-use-using]
2 | typedef volatile int U;
| ^~~~~~~~~~~~~~~~~~~~~~
| using U = int
```

gives

```cpp
using T = int;
using U = int:
```

viz. CV-qualifiers are removed.

Reproduce the issue with the shown a.cpp input and the modernize-use-using check command. Trace that check's handling of const and volatile typedefs; done means the suggested using declarations preserve both qualifiers and the command no longer removes them.

Written by the indexing model from the issue text.