Add Additional Config from Config.json and Clean Up Unused Config (#2178)

* 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.

src/SelfServe/SqlX/SqlX.rp.ts

@@ -269,7 +269,7 @@ export const getOfferingIds = async (regions: Array<RegionItem>): Promise<Offeri
         host: configContext.CATALOG_ENDPOINT,
         path: getOfferingIdPathForRegion(),
         method: "GET",
-        apiVersion: "2023-05-01-preview",
+        apiVersion: configContext.CATALOG_API_VERSION,
         queryParams: {
           filter:
             "armRegionName eq '" +