[test] Run more variants on mac-arm64 builders

No-Try: true
Bug: chromium:1126457
Change-Id: Iea2f8f37b172fb130c13b0f1d397eb5789c82893
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2423720
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70051}

infra/testing/builders.pyl

@@ -647,7 +647,7 @@
       'pool': 'chromium.tests.mac-arm64',
     },
     'tests': [
-      {'name': 'v8testing', 'variant': 'default'},
+      {'name': 'v8testing'},
     ],
   },
   'v8_mac_arm64_dbg_ng_triggered': {
@@ -657,7 +657,7 @@
       'pool': 'chromium.tests.mac-arm64',
     },
     'tests': [
-      {'name': 'v8testing', 'variant': 'default'},
+      {'name': 'v8testing'},
     ],
   },
   'v8_mac_arm64_full_dbg_ng_triggered': {
@@ -667,7 +667,7 @@
       'pool': 'chromium.tests.mac-arm64',
     },
     'tests': [
-      {'name': 'v8testing', 'variant': 'default'},
+      {'name': 'v8testing'},
     ],
   },
   'v8_mac_arm64_sim_rel_ng_triggered': {
@@ -1273,7 +1273,7 @@
       'priority': 35,
     },
     'tests': [
-      {'name': 'd8testing', 'variant': 'default'},
+      {'name': 'd8testing'},
     ],
   },
   'V8 Mac - arm64 - sim - debug': {