chore(Test): Remove all *.template_debug.golden files.

Will rename *.template_release back to *.template (no _release) in later CL.

PiperOrigin-RevId: 200569680

Author: matanlurey

_goldens/build.yaml

@@ -8,7 +8,6 @@ targets:
         generate_for: ["test/_files/**"]
         options:
           extensions:
-            debug: ".template_debug.check"
             release: ".template_release.check"
             outline: ".template_outline.check"
 
@@ -17,11 +16,9 @@ builders:
     target: "goldens"
     import: "../../../tool/src/builder.dart"
     builder_factories:
-      - debugBuilder
       - releaseBuilder
       - outlineBuilder
     build_extensions:
       ".dart":
-        - ".template_debug.check"
         - ".template_release.check"
         - ".template_outline.check"