Show "Expired" for expired licenses

[hardillb]

fixes #4889

Description

Admin overview showed "Expires: 2025-01-01" even when license has already expired, implying there was time left.

Now shows "Expied: 2024-01-01" after license has expired.

Related Issue(s)

#4889

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

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 78.43%. Comparing base (6d814ed) to head (488215d).
Report is 22 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4967   +/-   ##
=======================================
  Coverage   78.43%   78.43%           
=======================================
  Files         325      325           
  Lines       15353    15353           
  Branches     3530     3530           
=======================================
  Hits        12042    12042           
  Misses       3311     3311           

Flag	Coverage Δ
backend	78.43% <ø> (ø)

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[ZJvandeWeg]

@hardillb One style nitpick, but happy to be ignored and this to be merged as is.