Use execute_batch in more places (#9188)

changelog.d/9188.misc

synapse/storage/database.py

synapse/storage/databases/main/devices.py

synapse/storage/databases/main/event_push_actions.py

synapse/storage/databases/main/events_bg_updates.py

synapse/storage/databases/main/media_repository.py

synapse/storage/databases/main/purge_events.py

synapse/storage/databases/main/registration.py

synapse/storage/databases/main/roommember.py

.../storage/databases/main/schema/delta/59/01ignored_user.py

synapse/storage/databases/main/search.py

synapse/storage/databases/state/store.py