Allow users to proceed to the execution screen without previewing workspaces

Created by: danielmarquespt

Nowadays the user needs to preview the workspaces before proceeding. This is blocking and frustrating for advanced users that are comfortable with the search query or are just making changes to the batch spec. This allows for faster interations for the user

Proposed solution: Allow users to advance to the execution screen While resolving the steps the execution screen displays a skeleton layout while resolving

Notes: Associated slack thread: https://sourcegraph.slack.com/archives/CMMTWQQ49/p1654521750454979