Store crash_revision on testcases as integer. (#4167)

Fixes
https://pantheon.corp.google.com/errors/detail/CJ2ZybrV4qDV3gE;time=P1D;locations=global?e=-13802955&invt=AbZefA&mods=logs_tg_prod&project=clusterfuzz-external

Author: jonathanmetzman

src/clusterfuzz/_internal/bot/tasks/utasks/fuzz_task.py

@@ -908,7 +908,7 @@ def create_testcase(group: uworker_msg_pb2.FuzzTaskCrashGroup,
       regression=get_regression(group.one_time_crasher_flag),
       fixed=get_fixed_or_minimized_key(group.one_time_crasher_flag),
       one_time_crasher_flag=group.one_time_crasher_flag,
-      crash_revision=uworker_output.fuzz_task_output.crash_revision,
+      crash_revision=int(uworker_output.fuzz_task_output.crash_revision),
       comment=comment,
       absolute_path=crash.absolute_path,
       fuzzer_name=uworker_input.fuzzer_name,