[infra] Try running gcmole on Python3 bot

No-Try: true
Bug: chromium:1292013
Change-Id: If2a52f19fc200d440d840ec903e053926eaeecd0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3452025
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Almothana Athamneh <almuthanna@chromium.org>
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79029}

infra/testing/builders.pyl

@@ -497,6 +497,7 @@
     },
     'tests': [
       {'name': 'v8testing', 'shards': 2},
+      {'name': 'gcmole'},
     ],
   },
   'v8_linux64_single_generation_dbg_ng_triggered': {
@@ -1374,6 +1375,7 @@
     },
     'tests': [
       {'name': 'v8testing', 'shards': 2},
+      {'name': 'gcmole'},
     ],
   },
   'V8 Linux64 - shared': {