fix: validate sample events (#6662)
fix: validate sample events (#6662)

These events were not passing through the full validation steps and
we were missing an event processing error caused by the timestamp being
too old in `tests/acceptance/test_issue_details.py`. This in turn caused
visual diffs between my schemas branch and master.

Whether to fix the test as well so that the sample events don't generate
an error is an open question.
mvaled/sentry,looker/sentry,mvaled/sentry,ifduyue/sentry,looker/sentry,gencer/sentry,mvaled/sentry,gencer/sentry,beeftornado/sentry,looker/sentry,looker/sentry,ifduyue/sentry,looker/sentry,mvaled/sentry,mvaled/sentry,ifduyue/sentry,gencer/sentry,beeftornado/sentry,mvaled/sentry,gencer/sentry,gencer/sentry,ifduyue/sentry,beeftornado/sentry,ifduyue/sentry