[24.0] Fix admin cancel job message not being displayed to the user

[davelopez]

Fixes #19487

I'm not sure when this stopped working so I targeted 24.0 but all this code seems untouched for a long time 🤔

It looked like the message should be set somehow in:

galaxy/lib/galaxy/managers/jobs.py

Line 288 in 062cdda

self.app.job_manager.stop(job, message=message)

but this function does nothing in my testing, the actual dataset info seems to be set in job.mark_deleted so I moved it there with these changes. I hope this is the right fix.

I will follow up with the feature request to optionally send notifications to the users in a new PR targeting dev.

Before	After

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• 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]

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