Show YAML Editor for DAP Flows

Vanessa Ottorequested to merge
578228-show-yaml-editor-for-dap-flows--frontend-final into master

What does this MR do and why?

This MR combines the multiple MRs to add the YAML editor for DAP Flows. No new changes have been added. This MR can now be reviewed and merged into master.

There will be a follow up MR. It will fix some comments of part 3. But it can be merged later, after this one. The follow up MR might conflict with these changes.

Related to #578228

Edited by Vanessa Otto

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