fix: users can see inaccessible RPs

[eecsliu]

Description

There was previously no distinction between RPs with no bindings, and RPs that a user did not have access to, as both would appear to have no bindings. As of this PR, if a user does not have access to a workspace that is bound to a resource pool, we should be able to detect it and return a not found error.

Test Plan

using two workspaces (A and B), bind A to a resource pool. create a user with edit access to B, and use the CLI command det rp bindings list-workspaces <resource pool name>. You should get an error that the resource pool "does not exist or is not available to view".

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

[netlify]

✅ Deploy Preview for determined-ui ready!

Name	Link
🔨 Latest commit	6e21b56
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/64e523927f01220008b0bbad
😎 Deploy Preview	https://deploy-preview-7707--determined-ui.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.