Austenem/CAT-959 Update epic labels

[austenem]

Summary

Use assay_display_name instead of pipeline when labelling EPIC dataset sections, which do not have pipeline values.

Design Documentation/Original Tickets

CAT-959 Jira ticket

Testing

Tested with the Segmentation Mask EPIC currently on dev: http://localhost:5001/browse/dataset/22901da5f080b219a514e38381acbb0e?redirected=True&redirectedFromId=HBM474.PFWF.998#section-hbm474.pfwf.998-qa

Screenshots/Video

Test instance:

Local:

Checklist

• [X] Code follows the project's coding standards
  • [X] Lint checks pass locally
  • [X] New CHANGELOG-your-feature-name-here.md is present in the root directory, describing the change(s) in full sentences.
• [X] Unit tests covering the new feature have been added
• [X] All existing tests pass
• [X] Any relevant documentation in JIRA/Confluence has been updated to reflect the new feature
• [X] Any new functionalities have appropriate analytics functionalities added