Explore necessity of custom Filter Integration for Sentry

[brad-decker]

In #20132 we added onto the 'beforeSend' method to return null if the participateInMetaMetrics flag is not true. In a new PR we could check to see if this is sufficient and if the Filter integration that we run serves other purposes other than filtering out events based on the participateInMetaMetrics flag. Its possible we could eliminate some code from the code base.

[brad-decker]

@Gudahtt pointed out on #20132 that this would be a revert to a change made to preventing the Dupe filter from filtering out events that occur after the participateInMetaMetrics flag changes. If you fire an error while opted out then opt in and fire the same error the new error will be ignored because Dedupe is unaware of the effects of beforeSend.