Typing info can be lost if user supplies a Woodwork initialized cutoff time dataframe

### Typing info can be lost if user supplies a Woodwork initialized cutoff time dataframe

Based on current code in the woodwork-integration branch of `calculate_feature_matrix.py` (https://github.com/alteryx/featuretools/blob/5b6b1ed0540d9f7435599b497417d35233146320/featuretools/computational_backends/calculate_feature_matrix.py#L164-L173), if a user supplies a cutoff time dataframe that has Woodwork initialized, the typing information set by the user can be lost.

We should update the code in calculate_feature_matrix to make sure user-supplied typing information is retained. This will also require updating code in the `_validate_cutoff_time` util function to make sure operations there do not cause typing information to be lost.

We should also add a test to make sure that user supplied typing information for pass-through columns on the cutoff time dataframe is retained to the feature matrix.