OpenQASM runner does not use virtual environment when run from C++

[dime10]

Our OpenQASM runtime tests fail trying to import required packages when a virtual environment is used and the global environment does not have numpy and amazon-braket-sdk installed:

(new_env) ➜ catalyst git:(main) ✗ make test-runtime

/catalyst/runtime/tests/Test_OpenQasmDevice.cpp:624: FAILED:
due to unexpected exception with message:
  Traceback (most recent call last):
    File "<string>", line 3, in <module>
  ModuleNotFoundError: No module named 'braket.aws'

===============================================================================
test cases:  34 |  28 passed |  6 failed
assertions: 183 | 151 passed | 32 failed

At least this is the behaviour observed on macOS with the official Python installer and the built-in venv module.

[dime10]

There are a few possible components that could be responsible here:

• the cmake python discovery in the runtime
• the interpreter instantiation in our runtime tests
• the python module execution with nanobind

It might also be useful to compare some data from our developers using virtual environments on linux and macos.