Workflow Editor Activity Bar

[ElectronicBlueberry]

Brings the activity bar to the workflow editor.
Early stages, but open for suggestions

Planned activities for this PR:

• changes (undo redo stack ui)
• workflows (to insert like tools)

Ideas for additional activities, but unsure about:

• workflow specific utility tools
• workflow attributes
  this would free up the right panel to serve a single purpose
• step list
• subworkflows (in this workflow)
• invocations of this workflow
• run with simplified run form
• edit report

How to test the changes?

(Select all options that apply)

• 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.

[ahmedhamidawan]

This might tie in nicely with the ideas in #18166?

[bgruening]

The first round of feedback:

• separate "inputs" from tools, inputs are imho equivalent to "Upload"
• An easy way to exit is missing imho, "save and exit" instead of "save" might be an option, especially since we now have the "changes" option
• if there are no "workflows" then a hint should be shown like "Here are all workflows listed that you can include as sub-workflows"
• Q: is it useful to list the self-workflow? Is that even possible to include them in a workflow? Recursion?
• Should Ctrl+S save the workflow?
• if you click on tools, the focus should be on the search-box

Thanks @ElectronicBlueberry!