Add workflow test and history for SC cell cycle regression tutorial

[pavanvidem]

First version WF test of this tutorial

[bgruening]

@pavanvidem I think if you rename the workflow, you need to add a redirect. To the other PRs as well.

e.g.

training-material/topics/single-cell/tutorials/scrna-case_alevin/workflows/index.md

Line 3 in a7709f1

redirect_from:

maybe?

[shiltemann]

@bgruening @pavanvidem In this case it is a bit more complicated, since the workflow html page is created at build-time, so no good place to put the redirect_from directive currently.

If possible, I would simply avoid renaming the workflow file (the title of the workflow can always be updated of course). Or would this lead to problems for you @pavanvidem?

long-term I will think about how to best handle these cases, but for now probably easiest to just keep the original file names

[pavanvidem]

@shiltemann is that what you meant?

[pavanvidem]

sorry, I renamed a wrong file

[bgruening]

I guess you need to rename this back to main_workflow.ga?

[shiltemann]

Thanks @pavanvidem!