Deletion of Workflows

[AlejandroEsquivel]

Overview

• Move the logic of workflow deletion logic covalent_ui/api/v1/data_layer/summary_dal.py:delete_dispatches to a delete_workfow function located in covalent dispatcher
• The workflow deletion logic should be reviewed to ensure it is sound and exposed as an API endpoint DELETE /api/result/:dispatch_id in covalent_dispatcher that invokes the above method
• A separate delete method should be exposed by the SDK that calls the above endpoint
• Update UI to call the above endpoint