feat: remove the registration.enable_failure_logging temporary Waffle…

[Yagnesh1998]

Description:
It's a temporary toggle that needs to be removed from the platform. It enables the logging of validation errors in the registration process.

 def _log_validation_errors(self, request, errors, status_code):
        if not REGISTRATION_FAILURE_LOGGING_FLAG.is_enabled():
            return

Discussion thread: https://discuss.openedx.org/t/deprecation-removal-registration-enable-failure-logging/7463
Supporting information:
We plan to deprecate and remove the registration.enable_failure_logging temporary WaffleFlag.This was a temporary waffle and is no longer needed as per the original issue:openedx/public-engineering#84

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[Yagnesh1998]

@dianakhuang all tests have been passed when ever u have time please review them and let me know.

[dianakhuang]

From what I understand from the conversation topics above, we would like to remove the logging code entirely along with the toggle itself.

[dianakhuang]

Yup, this looks good. I'll merge once tests pass.

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.