Remove feature flag reachability_es_filter

Zamir Martinsrequested to merge
remove_reachability_es_filter into master

What does this MR do and why?

Remove feature flag reachability_es_filter.

References

Related issue: [Feature flag] Cleanup reachability_es_filter (#557477 - closed) • Zamir Martins • 18.3

FF rollout issue: [FF] `reachability_es_filter` -- roll out issue (#551924 - closed) • Zamir Martins • 18.3

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Edited by Zamir Martins

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