Update Collections with Mongoose Upgrade

[raclim]

Changes:

• refactor listCollections() to async/await
• update typo in removeProjectFromCollection.js
• update collection and project models setup to match mongoose 6.13.0 (addresses errors with loading and updating collections)

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]

Release Environments

This Environment is provided by Release, learn more!
To see the status of the Environment click on Environment Status below.

• p5.js-web-editor
  • app-tedb2ad.release.editor.p5js.org/
  • preview-tedb2ad.release.editor.p5js.org/

🔧Environment Status : https://app.release.com/public/Processing%20Foundation/env-6b808a3051

[lindapaiste]

Does it make a difference that we changed this from return next() to just next()?