* Cleaning up unused config from portal backend migration.
* Remove config used during backend migration.
* Add backend endpoint override from config.json.
* Add AAD and ARM endpoint overrides from config.json.
* Add GRAPH_ENDPOINT override from config.json.
* Remove unused catalog api version.
* Remove isTerminalEnabled from config. Cannot find reference in DE, DE Release, or Frontend.
* Fix mongo client unit tests.
* Removing BackendApi from constants since no longer referenced in the codebase.
* Talked with Tara and added the CATALOG_API_VERSION back to the config and substituted out the hard coded string it was intended to replace.
* Include existing portal backend endpoints in default allow list.
* Add localhost:1234 endpoint for Mongo unit tests.
* Removing old backend local test endpoint from backend endpoint list.
