Add exceptions to the signed quantization coupling tests

Main commit is in frameworks/ml/nn. This one only renames
testModel.hasQuant8AsymmOperands() to
testModel.hasQuant8CoupledOperands().

Bug: 143935412
Bug: 143934188
Bug: 143935353
Bug: 143934467
Bug: 143934184
Test: quantization coupling tests in CTS and VTS
Change-Id: I0f7c331c355fe61ee06605786f09bc1ca7cdef57