Project whitelist for JupyterHub deployment

What does this MR do?

Only allow users with Developer+ access to the project to login to JupyterHub application created under that project.

What are the relevant issue numbers?

52536

Testing

Apart from the automated tests I manually verified the login functionality for following cases:

• User not part of the project - Login forbidden
• User with guest access to project - Login forbidden
• User with Developer access to project - Login succeeds

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• [-] Security reports checked/validated by reviewer