Relocate immersive editor components to a common namespace

[cstns]

Prerequisites

branched of #6623 which needs to be merged in first

Description

Relocating immersive editor components in a common namespace for them to be used by the remote instance editor as well

Related Issue(s)

part of #6599

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 76.66%. Comparing base (edccbcb) to head (cab8d05).

Additional details and impacted files

@@                            Coverage Diff                             @@
##           chore/extract-device-editor-nested-routes    #6624   +/-   ##
==========================================================================
  Coverage                                      76.66%   76.66%           
==========================================================================
  Files                                            398      398           
  Lines                                          20103    20103           
  Branches                                        4841     4841           
==========================================================================
  Hits                                           15411    15411           
  Misses                                          4692     4692           

Flag	Coverage Δ
backend	76.66% <ø> (ø)

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