fix: get registration fields from site configuration (master)

[DmytroAlipov]

Description

There is currently no way to control the REGISTRATION_EXTRA_FIELDS setting in Site Configuration.

This fix adds the ability to control whether or not this field is displayed on the legacy registration page.

By default, data is taken from the settings.

Changes in the admin panel do not affect the behavior of this field in the Authn MFE:

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[DmytroAlipov]

Something is broken in the pipelines. Can anyone help with this?

[e0d]

Your branch is behind the base. I've pulled in changes from master as a merge commit which will update your branch and cause the tests to be re-run.

[mphilbrick211]

Hi @openedx/vanguards! Would someone be able to please review/merge for us?

There is also a backport: #33162

[zainab-amir]

We have created a ticket in our backlog to review this change.

[openedx-webhooks]

@DmytroAlipov 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[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.