OEP-34: Lint Amnesty Update (pylint violation thresholds and diff-quality removal)

Hi everyone,
Under the implementation of OEP-34: Lint Amnesty, following changes have been made in edx-platform quality tests through the PR:
Changes :

Impact on quality builds:

  • Previously, a quality build could be made to pass by increasing the warning thresholds instead of actually fixing the warnings. Now, either fixing/suppressing the warning will be necessary for the build to pass.