fix(frontend): Prevent namespace authorization bypass in artifact requests

[akagami-harsh]

Description of your changes:

• Fixes [backend] Security exploit in mlpipeline-UI #9889
• This PR addresses the vulnerability where Alice could access Bob's artifacts by removing the ?namespace=xxx parameter from artifact URLs.
• Users can no longer remove namespace parameter to access unauthorized artifacts
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[akagami-harsh]

working on adding a test for it.

[juliusvonkohout]

Do you mean to write a function is_authorized? Because I do not know what authorizeFN is supposed to mean. Please align with @HumairAK and @hbelmiro for the coding style.

[juliusvonkohout]

And it is a wonderful effort that we also need for graduatioon