Revamp github integration (#64190)

.coveragerc

CODEOWNERS

homeassistant/components/github/__init__.py

homeassistant/components/github/config_flow.py

homeassistant/components/github/const.py

homeassistant/components/github/coordinator.py

homeassistant/components/github/manifest.json

homeassistant/components/github/sensor.py

homeassistant/components/github/strings.json

homeassistant/components/github/translations/en.json

homeassistant/generated/config_flows.py

requirements_test_all.txt

tests/components/github/__init__.py

tests/components/github/common.py

tests/components/github/conftest.py

tests/components/github/test_config_flow.py