Raise UpdateFailed when here_travel_time cannot find_location

[eifinger]

Proposed change

Fixes #83100

Properly raise an UpdateFailed and provide more information.
The integration now starts later, to give sensors and other entities it might depend or more time to finish set up.

I tried to use self.coordinator.async_config_entry_first_refresh instead of self.async_update here but this led to a lot of failing tests due to uncaught errors. I tried to use with pytest.raises but with no effect.

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Additional information

• This PR fixes or closes issue: fixes Here travel time: unknown are not valid coordinates #83100
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[eifinger]

Found a way using async_config_entry_first_refresh but have a conflict with state restoration

[eifinger]

Found a way using async_config_entry_first_refresh but have a conflict with state restoration

I removed the Draft state. The current solution definately fixes the issue. If using async_config_entry_first_refresh turns out to be even more of an improvement I will open a follow up PR.