Check port on workspace authorizer

What does this MR do and why?

Check if the port is exposed for the workspace before authorizing the user to be able to access the given host.

References

• Follow-up from "Add internal API endpoint for w... (#568841)
• !203350 (comment 2734859255)

Screenshots or screen recordings

Screen_Recording_2025-09-18_at_5.54.12_PM

How to set up and validate locally

1. Create a workspace.
2. Open the workspace URL. Everything should work fine.
3. Open the workspace URL and replace the port with a random value e.g. 1 (instead of 60001). It should give you a Not Found error.

MR acceptance checklist

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