[infra] Kill crashpad_handler, which seems to be sometimes hanging around.

Fix #59822

Change-Id: Ib79688664a95ab38dc3eab8a49b2f46a477a2eb3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/402721
Reviewed-by: Siva Annamalai <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: aam

tools/task_kill.py

@@ -259,6 +259,7 @@ def KillDart():
     status += Kill("gen_snapshot", dump_stacks=True)
     status += Kill("dartaotruntime", dump_stacks=True)
     status += Kill("flutter_tester", dump_stacks=True)
+    status += Kill("crashpad_handler", dump_stacks=True)
     return status