Remove old debug UI

[VillePihlava]

Summary

This PR removes the old debug UI (application/src/client/classic-debug). Debug layers added back temporarily in #6497 were also removed. I also removed and changed some related documentation.

Issue

N/A

Unit tests

N/A

Documentation

I changed doc/user/Troubleshooting-Routing.md and doc/user/Frontends.md to indicate of this change. I did a quick search for more references of the old debug UI but could not find any. However, there might still be some references left in the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.06%. Comparing base (c6b53d1) to head (7a2f1d5).
Report is 9 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6478      +/-   ##
=============================================
+ Coverage      71.04%   71.06%   +0.02%     
- Complexity     18297    18300       +3     
=============================================
  Files           2005     2004       -1     
  Lines          75850    75829      -21     
  Branches        7779     7778       -1     
=============================================
+ Hits           53884    53886       +2     
+ Misses         19221    19200      -21     
+ Partials        2745     2743       -2     

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[leonardehrenfried]

You're also deleting the new debug UI and GraphiQL. Both of those we want to keep. :)

Deleting classic-debug is enough.

[VillePihlava]

You're also deleting the new debug UI and GraphiQL. Both of those we want to keep. :)

Deleting classic-debug is enough.

My mistake, thanks for pointing this out :D

[optionsome]

I converted this to draft since I was informed there still exist some debug layer related instructions for some OSM editors in Finland that haven't been yet updated to be about the new debug UI. Hopefully soon we can get rid of this.

[leonardehrenfried]

I have a few requests for Frontends.md but rather than playing review ping pong let's merge this and I will change it in a follow up.