feat(taskworker) Check 2% of tasks for pickle (#91624)

With all the known tasks fixed, increase the sample rate to try and find
more tasks using pickle.

Author: markstory

src/sentry/conf/server.py

@@ -735,7 +735,7 @@ def SOCIAL_AUTH_DEFAULT_USERNAME() -> str:
 # Complain about bad use of pickle.  See sentry.celery.SentryTask.apply_async for how
 # this works.
 CELERY_COMPLAIN_ABOUT_BAD_USE_OF_PICKLE = False
-CELERY_PICKLE_ERROR_REPORT_SAMPLE_RATE = 0.01
+CELERY_PICKLE_ERROR_REPORT_SAMPLE_RATE = 0.02
 
 # We use the old task protocol because during benchmarking we noticed that it's faster
 # than the new protocol. If we ever need to bump this it should be fine, there were no