Remove primitives V1

[edoaltamura]

What should we add?

When adding support for Qiskit 2.0, V1 primitives need to be removed, and only V2 primitives will be supported. This change is expected to be made around the release of our version 0.9.0.

[ttrenty]

A fresh installation of the library using pip install qiskit-machine-learning doesn't work as expected at the moment. It installs qiskit>=1.0, which currently resolves to qiskit-2.0.1. However, the tutorials at https://qiskit-community.github.io/qiskit-machine-learning/tutorials/index.html still rely on Qiskit 1.x primitives.

I had to run pip install "qiskit>=1.0,<2.0" --force-reinstall --upgrade to ensure compatibility with the tutorials.