Add a second approbation run for frontend that categorises ACs by apps, not categories

[Edd]

For frontend only, there are two different perspectives - Acceptance Criteria coverage by category and Acceptance Criteria coverage by app. To run both of these, we need to run approbation a second time with a different value for the categories parameter

Tasks

• Add a second stage that runs only for frontend-monorepo
• Add a new argument that can be configured to select the categories file representing ACs by app
• Make the new stage that that parameter for the --categories argument
  • Otherwise the run should be identical