Check if tests are working properly for SamplerV2 support on update-samplerv2 branch.

[OkuyanBoga]

I made a new branch for SamplerV2 support for SamplerQNN, where both V1 and V2 primitives are supported for backward and forward calls.
Only base_sampler_gradient, spsa_sampler_gradient, param_shift_sampler_gradient are supported.

To do:

• Add tests for V2 primitives to test/neural_networks/test_sampler_qnn.py.
• Add changes to the tutorials.
• Ensure torch connector works correctly.