Enable/disable Expert Insights mode with feature flag and integrate conditional rendering in expert components

[cstns]

Description

Adds the ability to conditionally render the insights/support toggle for the expert. The support mode is set by default and if no toggle is available then the switch cannot occur neither through the GUI or programmatically.

example of configuration needed

expert:
  insights:
    enabled: true

Related Issue(s)

closes https://github.com/FlowFuse/engineering/issues/23

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 76.29%. Comparing base (2dd3a7a) to head (405c1df).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7046   +/-   ##
=======================================
  Coverage   76.29%   76.29%           
=======================================
  Files         405      405           
  Lines       20346    20348    +2     
  Branches     4893     4895    +2     
=======================================
+ Hits        15523    15525    +2     
  Misses       4823     4823           

Flag	Coverage Δ
backend	76.29% <100.00%> (+<0.01%)	⬆️

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