Remove the zha-quirks compatibility shims once a zha-quirks release with the entity APIs is required #980

Summary

#919 and #978 added two compatibility shims so that zha-quirks releases without zigpy/zha-device-handlers#5410 keep working. That PR is merged, but the newest zha-quirks release (2.3.0) predates it. The shims can be removed once every zha-quirks version that can run with ZHA includes it. In practice, that is when HA Core pins a zha-quirks release with it and zha's own lock uses one.

Changes

• from_quirk in ZclPlatformEntity.__init__ (zha/application/platforms/__init__.py, TODO "remove this backwards compatibility shim after zha-device-handlers#5410 is merged"). Only zha-quirks releases before that PR pass this keyword.
• The deprecated endpoint and targets_cluster on the RSSI/LQI sensors (zha/application/platforms/sensor/__init__.py, TODO "remove once zha-quirks only filters ZclPlatformEntity by endpoint/cluster and HA Core's websocket_get_groupable_devices no longer reads entity.endpoint"). The quirks half is done in Add APIs to directly create ZHA entities zha-device-handlers#5410: EntityFilter only checks endpoint and cluster on ZclPlatformEntity. The HA Core half is still open: websocket_get_groupable_devices (homeassistant/components/zha/websocket_api.py) still filters entities with entity_ref.entity_data.entity.endpoint.id == ep_id.
• Snapshot: when zha's lock picks up the first zha-quirks release with that PR, regenerate tests/data/devices/frient-a-s-splzb-141-0x00020009.json. The frient quirk now replaces the device temperature entity with WholeDegreeDeviceTemperature. When this was checked against the PR branch, only class_name and suggested_display_precision changed in the snapshot.