chore: Split UserRoles out of Store

[julian-determined-ai]

Description

chore: Split UserRoles out of Store WEB-585

This splits UserRoles and UserAssignments into their own store.

Test Plan

1. Navigate to the WebUI open the console and ensure there are no errors related to permissions.
2. Activate the rbac feature flag using ?f_rbac=on. Ensure there is a 501 error due to /api/v1/permissions/summary and the UI still loads correctly.

Commentary (optional)

I have removed the initialization of the user roles that was:

  userRoles: [
    {
      id: -10,
      name: 'INITIALIZATION',
      permissions: [],
    },
  ],

please let me know if that needs to be restored.

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.

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[mapmeld]

small change, but can <UserRolesProvider> be nested inside of <HelmetProvider>?

[mapmeld]

maybe the ordering of this doesn't matter; I saw the Settings.test has this too

[mapmeld]

ok it looks like userRoles was initialized for canViewWorkspaces to be true in the brief time between when you arrive on the site, and when you load user roles and permissions. Is there something in the new store which could do this same function? And you could remove the relevant (!!userRoles && userRoles.length === 1 && userRoles[0].id === -10) || from usePermissions.ts

[mapmeld]

LGTM, noting we think init userRole is no longer needed

[gt2345]

Is there a specific reason we want to keep userAssignments in old Store?