V8: Switch ignition test steps to the standard suite alias

scripts/slave/recipes/v8.expected/full_tryserver_v8_v8_mac_rel_ng.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.v8",
       "--builder",
       "v8_mac_rel_ng",
@@ skipping 326 matching lines @@
       "-u",
       "RECIPE_MODULE[build::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/bot_default.isolated.gen.json",
-      "[SLAVE_BUILD]/v8/out/Release/ignition.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/mozilla.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/simdjs.isolated.gen.json",
       "[SLAVE_BUILD]/v8/out/Release/test262.isolated.gen.json"
     ],
     "name": "isolate tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"bot_default\": \"[dummy hash for bot_default]\", @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"ignition\": \"[dummy hash for ignition]\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"mozilla\": \"[dummy hash for mozilla]\", @@@",
       "@@@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": [],
     "name": "trigger",
@@ skipping 12 matching lines @@
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "patch_project": "v8",
           "patch_storage": "rietveld",
           "patchset": "1",
           "reason": "CQ",
           "requester": "commit-bot@chromium.org",
           "revision": "12345",
           "rietveld": "https://codereview.chromium.org",
           "swarm_hashes": {
             "bot_default": "[dummy hash for bot_default]",
-            "ignition": "[dummy hash for ignition]",
             "mozilla": "[dummy hash for mozilla]",
             "simdjs": "[dummy hash for simdjs]",
             "test262": "[dummy hash for test262]"
           }
         }
       }
     ],
     "~followup_annotations": [
       "@@@STEP_TEXT@v8_mac_rel_ng_triggered@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]