fix (some) test suite warnings

[khanniie]

Fixes the test suite warnings that are unrelated to the React lifecycle, which I assume will be resolved as a side effect of the ongoing class -> functional conversion.

Changes:

• Provides the props that were missing but marked as required in the EditorAccessibility tests and ErrorModal tests
• creates a fake version of window.confirm which is missing from the jsdom environment but used in the FileNode tests
• hides the extra log in the createProject test and changes it from a log to a warning type in the controller itself

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

[release-com]

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• p5.js-web-editor
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[raclim]

This is awesome! Thanks so much for working on this!

Pinging at @nahbee10 to see if she has any additional thoughts as well—otherwise I think I'm going go ahead with merging this in tomorrow!

[raclim]

I'm going to go ahead with merging this in, but please feel free to note if any additional thoughts comes up!

[khanniie]

Yay! thanks rachel!! : )