Refactor diffs module to use ModelDiffRunner class

[SujataSaurabh]

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[priyakasimbeg]

@SujataSaurabh could you sign the CLA form again with your email you use for github? The CLA check on this PR is failing. The form can be found here: https://forms.gle/Ew1KkBVpyeJDuRw67.

[priyakasimbeg]

This looks like a good start! Could you modify the compare.py files to use the ModelDiffRunner as well in this PR?