CI: Print on-target debug logs when the tests fail

Author: https://github.com/trflynn89
Commit: a8f9f160f9
Pull-request: https://github.com/SerenityOS/serenity/pull/9479

Meta/Azure/Serenity.yml

@@ -83,6 +83,7 @@ jobs:
         [ ! -e debug.log ] || cat debug.log
       displayName: 'Print Target Logs'
       workingDirectory: $(Build.SourcesDirectory)/Build
+      condition: failed()
 
     - script: |
         ccache -s