String formatting improvements for tests (#33663)

tests/components/alexa/__init__.py

tests/components/bom/test_sensor.py

tests/components/broadlink/test_init.py

tests/components/command_line/test_cover.py

tests/components/command_line/test_notify.py

tests/components/command_line/test_switch.py

tests/components/config/test_config_entries.py

tests/components/darksky/test_sensor.py

tests/components/datadog/test_init.py

tests/components/demo/test_vacuum.py

tests/components/device_tracker/test_init.py

tests/components/dialogflow/test_init.py

tests/components/efergy/test_sensor.py

tests/components/history/test_init.py

tests/components/image_processing/test_init.py

tests/components/influxdb/test_init.py

tests/components/locative/test_init.py

tests/components/logbook/test_init.py

tests/components/mobile_app/test_entity.py

tests/components/mqtt_room/test_sensor.py