Fix reaction like counting to exclude deprecated bookmarks and move computation to SQL

Fix reaction like counting to exclude deprecated bookmarks and move computation to SQL: a task in bird-critic-1.5-full-300 (Harbor dataset). The discourse-reactions plugin computes per-post reaction counts via reactions for post(post) . Two bugs exist in the current implementation:

The task

The `discourse-reactions` plugin computes per-post reaction counts via `reactions_for_post(post)`. Two bugs exist in the current implementation:

Part of kochsnow/bird-critic-1.5-full-300.