[Bug]: get_data_in_units fails for ElectricalSeries with channel_conversion

[h-mayorquin]

What happened?

#1745 added a method to get the data in the corect units which is something very nice that I always wanted.

One corner case that i think is not included is that the method will produce incorrect results with an ElectricalSeries object that has a channel conversion.

Steps to Reproduce

This fails on the dev branch:

from pynwb.testing.mock.ecephys import mock_ElectricalSeries

import numpy as np

data = np.asarray([[1, 1, 1, 1, 1], [1, 1, 1, 1, 1]])
conversion = 1.0
offset = 3.0
channel_conversion = np.asarray([2.0, 2.0])
electrical_series = mock_ElectricalSeries(
    data=data,
    conversion=conversion,
    offset=offset,
    channel_conversion=channel_conversion,
)

data_in_units = electrical_series.get_data_in_units()
expected_data =  data * conversion * channel_conversion[:, np.newaxis] + offset

np.testing.assert_almost_equal(data_in_units, expected_data)

Traceback

AssertionError: 
Arrays are not almost equal to 7 decimals

Mismatched elements: 10 [/](https://file+.vscode-resource.vscode-cdn.net/) 10 (100%)
Max absolute difference: 1.
Max relative difference: 0.2
 x: array([[4., 4., 4., 4., 4.],
       [4., 4., 4., 4., 4.]])
 y: array([[5., 5., 5., 5., 5.],
       [5., 5., 5., 5., 5.]])

Operating System

Windows

Python Executable

Conda

Python Version

lower version (unsupported)

Package Versions

No response

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