Update minimum NodeJS version to 24

[hardillb]

part of https://github.com/FlowFuse/engineering/issues/264

Description

As part of the 3.0.0 release we are moving to a minimum supported NodeJS version of 24

Related Issue(s)

https://github.com/FlowFuse/engineering/issues/264

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 76.09%. Comparing base (4651521) to head (ba6b5df).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8235   +/-   ##
=======================================
  Coverage   76.09%   76.09%           
=======================================
  Files         445      445           
  Lines       23991    23991           
  Branches     6404     6404           
=======================================
  Hits        18255    18255           
  Misses       5736     5736           

Flag	Coverage Δ
backend	76.09% <ø> (ø)

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