bug: retrieve panics when skuidMetadataService is not present in response #226
Description
When the response to GetRetrievePlan does not contain skuidMetadataService property, the CLI panics due to this line of code.
If an unexpected response is encountered, the CLI should handle and exit gracefully with an appropriate error message displayed to the user.
Similar to #225, what is the expected response from the server for api/v2/metadata/retrieve/plan endpoint? Will it always contain at least skuidMetadataService even if its Metadata types are empty? Is there any situation where it could return skuidCloudDataService but not skuidMetadataService?