Enable velbus config entries (#25308)

* Initial work on config_flow

* Finish config flow

* Pylint checks, make sure the import only happens once

* Added support for unloading, small fixes

* Check in the hassfest output files

* Flake8 fixes

* pylint mistake after flake8 fixes

* Work on comments

* Abort the import if it is already imported

* More comments resolved

* Added testcases for velbus config flow

* Fix pylint and flake8

* Added connection test to the config flow

* More sugestions

* renamed the abort reason

* excluded all but the config_flow.py from the velbus component in coveragerc

* Rewrote testcases with a patched version of _test_connection

* Docstyle fixes

* Updated the velbus testcases

* just yield

* flake8 fixes

homeassistant/generated/config_flows.py

@@ -56,6 +56,7 @@ FLOWS = [
     "twilio",
     "unifi",
     "upnp",
+    "velbus",
     "vesync",
     "wemo",
     "wwlln",