Implement config flow for nextcloud (#89396)

* implement config flow

* add tests

* fix hassfest and requirements

* abort import on connection error

* add add_suggested_values_to_schema

* mock async_setup_entry

* revert code owner change

* fix try connect in config flow

* add device info

* allow multiple instances

* fix import in config flow

* remove custom scan interval from coordinator

* applay suggestions

* apply suggestions

* take over ownership from @meichthys

* cleanup import data before passing to user step

* apply suggestions to tests

* add untested files to .coveragerc

homeassistant/generated/config_flows.py

@@ -282,6 +282,7 @@ FLOWS = {
         "netatmo",
         "netgear",
         "nexia",
+        "nextcloud",
         "nextdns",
         "nfandroidtv",
         "nibe_heatpump",