[APER-1922]
We are converting the legacy UI of the `records` app in the Credentials IDA (credentials.edx.org/records/, credentials.edx.org/records/programs/{uuid}, etc.) to a new MFE. Today, the Program Dashboard and the legacy (non-MFE) profile page have buttons that route learners to the Credentials IDA pages. We need to (optionally) introduce a way to route learner's to the new MFE instead.
- Introduces a new configuration setting called `LEARNER_RECORD_MICROFRONTEND_URL` (defaulting to None). This will be used by the LMS to store the base URL of the new MFE (e.g. records.stage.edx.org).
- Introduces a new waffle switch named `USE_LEARNER_RECORD_MFE`. This will be used to control whether routing learner's to the new MFE is enabled from the LMS's side.
- Updates the existing `get_credentials_records_url` function to add additional logic that will determine if we need to build a link to the legacy FE or the new MFE
- Adds tests for new and existing behavior. There were no existing unit tests for the utility function that I updated.
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