Fix: Logout error modal popping up on downloading other users' sketch…

[NishantBansal2003]

Fixes #3053

Changes: This update improves the 'downloadSketch' function by adding validation checks. It ensures that projects are only saved when the logged-in user owns them, reducing unnecessary API requests and enhancing the user experience.

I have verified that this pull request:

• [x] has no linting errors (npm run lint)
• [x] has no test errors (npm run test)
• [x] is from a uniquely-named feature branch and is up to date with the develop branch.
• [x] is descriptively named and links to an issue number, i.e. Fixes #3053

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• p5.js-web-editor
  • app-ted0d79.release.editor.p5js.org/
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:wrench:Environment Status : https://app.release.com/public/Processing%20Foundation/env-083ad3c08f

[raclim]

Thanks for your work on this! This ultimately ended up getting addressed by #3116, so I'm going to close this PR. I'm sorry that we couldn't get this in, but please feel free to check out our other issues!