Require name for workflows on save, set default to Unnamed Workflow

[ahmedhamidawan]

Also, use Toast instead of modal for empty name, as well as Toast.success on newly created workflow
Fixes #16998
Fixes #16997

Before
wf_editor_req_name_before.mp4

After
wf_editor_req_name_after.mp4

To Do:
- Also require name for Workflow update method (PUT /api/workflows/{id}) like we do for the create method (PUT /api/workflow/create) already. Done ✅

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]

Good improvement. Thanks @ahmedhamidawan !