Add isolate.clean_isolated_files and use in all related recipes.

scripts/slave/recipes/gpu/build_and_upload.expected/linux_release.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
     "name": "cleanup temp"
   },
   {
@@ skipping 65 matching lines @@
     ],
     "env": {
       "GYP_DEFINES": "archive_gpu_tests=1 blink_logging_always_on=1 component=static_library dcheck_always_on=1 disable_glibcxx_debug=1 gomadir='[BUILD]/goma' internal_gles2_conform_tests=1 target_arch=x64 test_isolation_mode=archive test_isolation_outdir=https://isolateserver.appspot.com use_goma=1"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
+      "[BUILD]/scripts/slave/recipe_modules/isolate/resources/find_isolated_tests.py",
+      "--build-dir",
+      "[SLAVE_BUILD]/src/out/Release",
+      "--clean-isolated-files"
+    ],
+    "name": "clean isolated files"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "[BUILD]/scripts/slave/compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-dir",
@@ skipping 29 matching lines @@
       "@@@STEP_LOG_LINE@json.output@  \"gles2_conform_test\": \"[dummy hash for gles2_conform_test]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"gpu_unittests\": \"[dummy hash for gpu_unittests]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tab_capture_end2end_tests\": \"[dummy hash for tab_capture_end2end_tests]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"telemetry_gpu_test\": \"[dummy hash for telemetry_gpu_test]\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@SET_BUILD_PROPERTY@swarm_hashes@{\"angle_unittests\": \"[dummy hash for angle_unittests]\", \"content_gl_tests\": \"[dummy hash for content_gl_tests]\", \"gl_tests\": \"[dummy hash for gl_tests]\", \"gles2_conform_test\": \"[dummy hash for gles2_conform_test]\", \"gpu_unittests\": \"[dummy hash for gpu_unittests]\", \"tab_capture_end2end_tests\": \"[dummy hash for tab_capture_end2end_tests]\", \"telemetry_gpu_test\": \"[dummy hash for telemetry_gpu_test]\"}@@@"
     ]
   }
 ]