DML EP Fix InstanceNormalization with 3D tensors

[fdwr]

Description: The DML EP previously only accepted NCHW (4D) for InstanceNormalization. This fixes the case where 3D tensors are passed (NCH), which would yield:

D3D12 ERROR: Mismatched tensor sizes. Tensor 'Input' has size of 1 in dimension 1, while tensor 'Scale' has size of 32 in dimension 1.
Both tensors are expected to have the same sizes in all dimensions. [ UNKNOWN ERROR #1: STRING_FROM_APPLICATION]
S:\WindowsAI\dml\SharedValidation/TensorValidator.h(439)\DirectML.Debug.dll!00007FF90212DE9B: (caller: 00007FF90211B969) Exception(1) tid(9af4) 80070057 The parameter is incorrect.
    [TensorValidator::ValidateIsBroadcastCompatibleWithFirst(E_INVALIDARG)]

Motivation and Context

• Why is this change required? What problem does it solve? Customer issue.
• If it fixes an open issue, please link to the issue here. InstanceNormalization: The parameter is incorrect error on DirectML #12677