Implementation Plan: Bulk moderation actions (#3719)

* Add implementation plan for bulk moderation actions

* Address feedback

- Capitalize Elasticsearch
- Clarify language
- Specify that new media filters should query Elasticsearch rather than Postgres

* Change duplicate_reports to deduplicated_reports

* Accept sarayourfriend approval

Co-authored-by: sarayourfriend <[email protected]>

* Extend clarification of non-constrained media ids

* Accept obulat approval

Co-authored-by: Olga Bulat <[email protected]>

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Co-authored-by: sarayourfriend <[email protected]>
Co-authored-by: Olga Bulat <[email protected]>