Get collection usage size with ARM metrics call (#327)

- Removed `readCollectionQuotaInfo` call. The only data we need is the usage size which we can get via the ARM metrics call instead.
- Added `getCollectionUsageSize` which fetches the `DataUsage` and `IndexUsage` metrics, converts them to KB, and returns the sum as the total usage size

src/Common/dataAccess/getIndexTransformationProgress.ts

@@ -14,7 +14,7 @@ export async function getIndexTransformationProgress(databaseId: string, collect
     const response = await client()
       .database(databaseId)
       .container(collectionId)
-      .read({ populateQuotaInfo: true });
+      .read();
 
     indexTransformationPercentage = parseInt(
       response.headers[Constants.HttpHeaders.collectionIndexTransformationProgress] as string