Add license and title validation to views.internal::create_nodes

[jonboiser]

Summary

Description of the change(s) you made

1. In views.internal::create_nodes, adds checks to validate the title and license. Sets the new node's complete field to false if the checks fail.
2. Some code cleanup

Manual verification steps performed

(I'm not sure how to test this, since I think this API is only used via Sushi Chef)

Reviewer guidance

How can a reviewer test these changes?

• Read the code carefully, does any of the new code do anything unsafe (e.g. commit a potential Key Error)

Are there any risky areas that deserve extra testing?

References

Partially addresses #2806, (does not invalidate nodes based on rest of criteria in mark_complete.py)

[codecov]

Codecov Report

Merging #2999 (116ab82) into develop (67913e8) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@ Coverage Diff @@## develop #2999 +/- ##
===========================================
+ Coverage 85.74% 85.77% +0.02% 
===========================================
Files 298 298 Lines 15843 15876 +33 ===========================================
+ Hits 13585 13618 +33 
Misses 2258 2258 

Impacted Files	Coverage Δ
...contentcuration/tests/views/test_views_internal.py	97.44% <100.00%> (+0.20%)	⬆️
contentcuration/contentcuration/views/internal.py	85.75% <100.00%> (+0.37%)	⬆️

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[rtibbles]

Nice!