Ratelimit presence updates (#18000)

changelog.d/18000.bugfix

docker/complement/conf/workers-shared-extra.yaml.j2

docs/usage/configuration/config_documentation.md

synapse/api/ratelimiting.py

synapse/config/ratelimiting.py

synapse/rest/client/presence.py

synapse/rest/client/sync.py

tests/handlers/test_presence.py

tests/rest/client/test_presence.py

tests/utils.py