`A15-2-2`: Add test cases for `std::nothrow` new calls

### Affected rules
 - `A15-2-2`

### Description

A15-2-2 customizes the exception flow model to represent that `new` calls may throw a `std::bad_alloc` exception. This code correctly handles the case that a `noexcept` constructor is called, but should be expanded to include a test case.
