[MM-53291] Data retention improvements (#24253)

* adding new migration for RetentionIdsForDeletion, changing logic for deleting orphaned reactions. Updating delete user and channel endpoints to remove respective reactions

server/channels/db/migrations/migrations.list

@@ -222,6 +222,8 @@ channels/db/migrations/mysql/000111_update_vacuuming.down.sql
 channels/db/migrations/mysql/000111_update_vacuuming.up.sql
 channels/db/migrations/mysql/000112_rework_desktop_tokens.down.sql
 channels/db/migrations/mysql/000112_rework_desktop_tokens.up.sql
+channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.down.sql
+channels/db/migrations/mysql/000113_create_retentionidsfordeletion_table.up.sql
 channels/db/migrations/postgres/000001_create_teams.down.sql
 channels/db/migrations/postgres/000001_create_teams.up.sql
 channels/db/migrations/postgres/000002_create_team_members.down.sql
@@ -444,3 +446,5 @@ channels/db/migrations/postgres/000111_update_vacuuming.down.sql
 channels/db/migrations/postgres/000111_update_vacuuming.up.sql
 channels/db/migrations/postgres/000112_rework_desktop_tokens.down.sql
 channels/db/migrations/postgres/000112_rework_desktop_tokens.up.sql
+channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.down.sql
+channels/db/migrations/postgres/000113_create_retentionidsfordeletion_table.up.sql