We previously checked Integration.config_flow to see if we should
pre-import the config flow, but this is now always set for some
integration like `homeassistant_green`, `hassio`, etc. Instead
we can add it to the rest of the platforms since we already know
which files exist. This simplifies the logic and ensures the pre-import
still happens if the file is there even if its not listed in the
manifest
`2024-03-04 22:54:31.906 DEBUG (MainThread) [homeassistant.loader] Importing platforms for homeassistant_green executor=[config_flow] loop=[] took 2.74s`