[24.0] Show dataset image in workflow_outputs display listing.

[dannon]

Fixes #16558

Another approach might be to overhaul the workflow outputs directive logic to divert between the two directives (history_dataset_as_image, history_dataset_display), but it seems nicer to me to just do the right thing for image datatypes in history_dataset_display.

How to test the changes?

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[martenson]

thanks @dannon !