fix: safely handle potential deps when not submitting step deps

[epmog]

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

Submitting without step dependencies would fail if there were no dependency_names in the node. ie. if the node we were submitting didn't have any dependencies to render.

What was the solution? (How)

Do a safe delete of the dependency names, and at the same time, fix the name of the step to just be the ROP name instead of {ROP Name}-{render_order}.

What is the impact of this change?

More workflows work

How was this change tested?

hatch run fmt
hatch build
hatch run lint
hatch run test
hatch shell
hatch run install

Launched Houdini and was able to submit jobs that contained nodes with and without deps, when "submit step deps" was not enabled.

Was this change documented?

N/A

Is this a breaking change?

Nope