test refactor for floating point failures + mypy fix

[armaan-dhillon]

PR Description

• refactors test_categorical_diff and test_diff_categorical_chi2_test which were failing locally due to some floating point errors but not failing when run on a different machine -- this refactors them so the floating point comparisons will be machine/platform agnostic
• updates the flake8 rev in .pre-commit-config.yaml (was running into a local error with older version)
• fixes one mypy error in dataprofiler/data_readers/parquet_data.py
• adds inline # type: ignore[override] comments for 4 lines causing mypy override errors with TODO statements for context
• above changes allow us to remove disable_error_code = override from setup.cfg

The 4 mypy override errors that this PR was supposed to address require adding a @property tag to the profile() method of NumericStatsMixin and this is a breaking change as it led to many tests failing. TODO comments highlight this.

[thebrianbn]

LGTM

[thebrianbn]

LGTM