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:

• 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 #3053

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[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!