fix: add deadline cloud soho script

Fixes: #168

What was the problem/requirement? (What/Why)

When the render button was clicked on the Deadline Cloud node the user would get a notification that no soho script was found.

What was the solution? (How)

Add a soho script and set it up to be run when the render button is clicked on the Deadline Cloud node. The script will display a message to the user that to render with the Deadline Cloud node they should click the submit button within the node instead of clicking render on it.

What is the impact of this change?

Hopefully less confusion on how to render with the Deadline Cloud node.

How was this change tested?

Made an empty scene with just a Deadline Cloud node and clicked render to verify that the "no soho script" error would show. Then made my changes and verified a new popup appeared that pointed me towards pressing the submit button in the node itself.

Have you run the unit tests? Yes

Was this change documented?

It will be documented as closing issue 168

Is this a breaking change?

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aws-deadline / deadline-cloud-for-houdini