Ensure Admin Settings page only shown to Admin users

[hardillb]

part of FlowFuse/security#74

Description

Ensure Admin settings UI pages only shown to Admin users.

Related Issue(s)

FlowFuse/security#74

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

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

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (2de789f) 41.74% compared to head (f117d48) 41.71%.
Report is 21 commits behind head on main.

Files	Patch %	Lines
frontend/src/pages/admin/Overview.vue	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3478      +/-   ##
==========================================
- Coverage   41.74%   41.71%   -0.04%     
==========================================
  Files         613      616       +3     
  Lines       23202    23220      +18     
  Branches     5615     5613       -2     
==========================================
  Hits         9686     9686              
- Misses      13516    13534      +18     

Flag	Coverage Δ
backend	78.67% <ø> (ø)
frontend	2.01% <0.00%> (-0.01%)	⬇️

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