Re-add usage_data_diff_searches flag to suppress Sentry errors
requested to merge 360517-feature-invalidfeatureflagerror-api-v4-usage_data-increment_counter into master
It turns out that we have "Lazarus" feature flags that can not be removed from the system without causing errors, due to being used in dynamic methods to track frontend usage statistics. Until this is unwound, we must keep these flags in the code base forever, or else we create all kinds of errors in Sentry.
Flag removed in !84320 (merged)
Related to #360517 (closed)
Edited by Kerri Miller