V8 Buildbot: Switch ignition tests to v8-side test set.

scripts/slave/recipes/v8.expected/full_client_v8_V8_Arm___builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "client.v8",
       "--builder",
       "V8 Arm - builder",
@@ skipping 123 matching lines @@
       "RECIPE_MODULE[isolate]/resources/isolate.py",
       "[SLAVE_BUILD]/v8/tools/swarming_client",
       "batcharchive",
       "--dump-json",
       "/path/to/tmp/json",
       "--isolate-server",
       "https://isolateserver.appspot.com",
       "--verbose",
       "[SLAVE_BUILD]/v8/out/Release/benchmarks.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/bot_default.isolated.gen.json",
-      "[SLAVE_BUILD]/v8/out/Release/mjsunit.isolated.gen.json",
+      "[SLAVE_BUILD]/v8/out/Release/ignition.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/optimize_for_size.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/simdjs.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/test262.isolated.gen.json"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "isolate tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"benchmarks\": \"[dummy hash for benchmarks]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"bot_default\": \"[dummy hash for bot_default]\", @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"mjsunit\": \"[dummy hash for mjsunit]\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"ignition\": \"[dummy hash for ignition]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"optimize_for_size\": \"[dummy hash for optimize_for_size]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"simdjs\": \"[dummy hash for simdjs]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"test262\": \"[dummy hash for test262]\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[gsutil]/resources/gsutil_wrapper.py",
       "--",
       "[DEPOT_TOOLS]/gsutil.py",
       "----",
       "cp",
       "-a",
       "public-read",
-      "{\"benchmarks\": \"[dummy hash for benchmarks]\", \"bot_default\": \"[dummy hash for bot_default]\", \"mjsunit\": \"[dummy hash for mjsunit]\", \"optimize_for_size\": \"[dummy hash for optimize_for_size]\", \"simdjs\": \"[dummy hash for simdjs]\", \"test262\": \"[dummy hash for test262]\"}",
+      "{\"benchmarks\": \"[dummy hash for benchmarks]\", \"bot_default\": \"[dummy hash for bot_default]\", \"ignition\": \"[dummy hash for ignition]\", \"optimize_for_size\": \"[dummy hash for optimize_for_size]\", \"simdjs\": \"[dummy hash for simdjs]\", \"test262\": \"[dummy hash for test262]\"}",
       "gs://chromium-v8/v8-arm-rel/full-build-linux_f2cbea7e89a45f46819777bb78a1f5bd0241f64c.json"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "gsutil upload",
     "~followup_annotations": [
       "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/chromium-v8/v8-arm-rel/full-build-linux_f2cbea7e89a45f46819777bb78a1f5bd0241f64c.json@@@"
     ]
   },
   {
     "allow_subannotations": true,
@@ skipping 23 matching lines @@
       {
         "builder_name": "V8 Arm",
         "properties": {
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "swarm_hashes": {
             "benchmarks": "[dummy hash for benchmarks]",
             "bot_default": "[dummy hash for bot_default]",
-            "mjsunit": "[dummy hash for mjsunit]",
+            "ignition": "[dummy hash for ignition]",
             "optimize_for_size": "[dummy hash for optimize_for_size]",
             "simdjs": "[dummy hash for simdjs]",
             "test262": "[dummy hash for test262]"
           }
         }
       }
     ],
     "~followup_annotations": [
       "@@@STEP_TEXT@V8 Arm@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]