[23.0] Prevent anonymous access to Storage Dashboard

[davelopez]

Follow-up and similar to #15906

Still minimal changes for 23.0, the Storage Dashboard only works for registered users.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[dannon]

Thanks! Looks good.