Migrate Intergas InComfort/Intouch Lan2RF gateway YAML to config flow (#118642)

* Add config flow

* Make sure the device is polled - refactor

* Fix

* Add tests config flow

* Update test requirements

* Ensure dispatcher has a unique signal per heater

* Followup on review

* Follow up comments

* One more docstr

* Make specific try blocks and refactoring

* Handle import exceptions

* Restore removed lines

* Move initial heater update in try block

* Raise issue failed import

* Update test codeowners

* Remove entity device info

* Remove entity device info

* Appy suggestions from code review

* Remove broad exception handling from entry setup

* Test coverage

homeassistant/generated/config_flows.py

@@ -256,6 +256,7 @@ FLOWS = {
         "imap",
         "imgw_pib",
         "improv_ble",
+        "incomfort",
         "inkbird",
         "insteon",
         "intellifire",