Consider how Galaxy tests relate to validation metrics

[denis-yuen]

Is your feature request related to a problem? Please describe.
Planemo has a test feature that is required for workflows to join the IWC
Consider if these tests can be highlighted or imported as a validation metric

https://planemo.readthedocs.io/en/latest/test_format.html
https://training.galaxyproject.org/training-material/faqs/gtn/gtn_workflow_testing.html

To facilitate usage by other users in the future, they have been deposited in the Intergalactic Workflow Commission (IWC) [[18](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003163/#CR18)], a curated repository for Galaxy workflows. To ensure reliability and reproducibility, the workflows are packaged together with tests which are run via continuous integration (CI). If tests are successful and the submission is approved by an IWC review, the submitted workflows are deployed to Dockstore [[19](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003163/#CR19)] and WorkflowHub [[20](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003163/#CR20)], two recently developed platforms for sharing scientific workflows.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9003163/

Describe the solution you'd like
See if we can assist in two cases

1. See which Galaxy workflows have been tested
2. Help a workflow developer discover the planemo test command

Additional context
See dockstore/dockstore-ui2#1940

┆Issue is synchronized with this Jira Story
┆Issue Number: DOCK-2517
┆Sprint: Backlog
┆Issue Type: Story