Enable immersive editor for Node-RED 4.0.2+ and Launcher 2.6.0+

[knolleary]

Part of #3800

Having verified the immersive editor is now working in production for the about-to-ship launcher version and Node-RED 4.0.2, this is the final step to update the editor button to direct to the right place if the conditions are met.

Technically, it will work with nr-launcher 2.5.2-2f3c495-202407020855.0 or later, but to keep things clean, am pinning it to tomorrow's release version.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.75%. Comparing base (2ee732c) to head (581bc29).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4096   +/-   ##
=======================================
  Coverage   78.75%   78.75%           
=======================================
  Files         285      285           
  Lines       13031    13031           
  Branches     2902     2902           
=======================================
  Hits        10263    10263           
  Misses       2768     2768           

Flag	Coverage Δ
backend	78.75% <ø> (ø)

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