[TEST] Add test linear_past_eltwise_add when the graph has multiple joins where to apply the transformation (was failing in this case) plu test moving linear tensor ops, not only scalar ones

turns out there was a problem with signed values after all
failing testcases with k=5 produce the indices of positive values correctly, but negative ones don't seem to be compared correctly (always producing index 0?)

this changed in the latest Brevitas export

Scaled and non-scaled QuantHardTanh activation tests separated. Non-scaled test includes cases with scale parameter == 1. In scaled test, bipolar activation is excluded as it's not currently supported

[Test] Change input argument to clock period for make_pynq_proj and create_stitched_ip  transformation

[Transformation and Test] Add option to adjust clock frequency in ipstitch and when making the pynq project get fclk from the metadata properties. Change tfc w1a1 test to test new feature

Add new test cases for QuantHardTanh. Cases for max > 1 and scaling_impl_type == ScalingImplType.PARAMETER with learned scale