💻 Remove developer mode

[boryanagoncharenko]

Removes:

• the developer's mode toggle under the code editor
• the mandatory developer's mode option in the class customization

Fixes #5987

How to test

• As a user, you should not be able to see the toggle for programmer's mode. Even if you are part of a class that has this a mandatory developer's mode customization. Whatever combination of adventure/quiz/puzzle sequence you open, the editor should have correct size. Use the parson puzzle on level 6 because it has 5 blocks which makes it higher than usual.
• If you are a teacher, you should not be able to see the mandatory developer's mode option in the class customization.

[Felienne]

Thanks!! Makes the interface a lot cleaner!

[Felienne]

I also tested the /tryout page, where is also works!

[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).