allow entering process graph without "process_graph" wrapper

[soxofaan]

The code editor requires that the process graph JSON is wrapped in {"process_graph": ...}
otherwise, when you try to switch to "visual mode", you get this "Process invalid" error:

Very often, when I do user support, the user shares their process graph without the {"process_graph": ...} wrapper.
Can't we just support that format too in the editor?

[m-mohr]

It requires it because that's how it is specified, a process requires the "process_graph". The other variant is a left over in the other clients from the old 0.x days. So I'd rather say, please implement the other clients in a way that they don't export invalid processes any more:

• Work on processes instead of process graphs openeo-python-client#155
• Process graph output from python client different from web editor openeo-python-client#209
• Give users the full process instead of just the graph openeo-r-client#54

So as this seems to bubble up again, I think Open-EO/openeo-python-client#155 should be re-opened?

A related issue is probably that for example in https://discuss.eodc.eu/t/renaming-existing-bands-bugged/442 users post Python dict representations, that can't be imported in JS either.

Related improvement planned for the Editor: #269

[soxofaan]

Regarding re-opening Open-EO/openeo-python-client#155 : I commented on that ticket itself.
I also closed Open-EO/openeo-python-client#209 as a duplicate of that.