[8064] Flaky spec > Offboarding redirect sometimes lands on login page

[n-lark]

Description

Makes offboarding.spec.js less flaky by disconnecting the subscribers before deleting a user so they stop fighting each other for redirects.

Related Issue(s)

Resolves #8064

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.14%. Comparing base (5c2e423) to head (ec25246).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8065   +/-   ##
=======================================
  Coverage   76.14%   76.14%           
=======================================
  Files         439      439           
  Lines       23571    23571           
  Branches     6281     6281           
=======================================
  Hits        17948    17948           
  Misses       5623     5623           

Flag	Coverage Δ
backend	76.14% <ø> (ø)

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