Cannot retrieve product solver names or options from terminals

https://github.com/ansys/pyedb-core/blob/0772bc46d2d9ce12421e36c86d2ce37ed3a5e3e1/src/ansys/edb/core/terminal/terminal.py#L282

https://github.com/ansys/pyedb-core/blob/0772bc46d2d9ce12421e36c86d2ce37ed3a5e3e1/src/ansys/edb/core/terminal/terminal.py#L319

These functions both fail with the below messages:

```
self =
product_id = , solver_name = 'HFSS'

def product_solver_option(self, product_id, solver_name):
"""Get the name of the product solver option.

Parameters
----------
product_id : ProductIdType
ID of the product.
solver_name : :obj:`str`
Name of the solver.

Returns
-------
:obj:`str`
Name of the product solver option.
"""
> return next(
solver.option
for solver in self._product_solvers(product_id)
if solver.name == solver_name
)
E TypeError: 'TermProductSolversMessage' object is not iterable

venv\lib\site-packages\ansys\edb\core\terminal\terminal.py:297: TypeError
```

Start in src/ansys/edb/core/terminal/terminal.py at the linked lines around the product solver name and option functions. Reproduce the calls shown in the traceback and inspect the value returned by _product_solvers. Done means terminal solver names and options can be retrieved without the reported TypeError, with relevant tests passing.

Written by the indexing model from the issue text.