feat: handle sleep behavior of MCU2 upgraded cars

[JakobLichterfeld]

changes from @micves from #3262, fixes #3084

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[brianmay]

I am having trouble making sense of this PR.

It started off simple (with the original first two commits from the first PR) and has become rather complicated, and IMHO hard to understand. And I am wondering if this complexity is really required.

Then there are some changes when in this PR that don't belong here; for example the changes to delete the "models2" entries. I think this might have been included in error.

There are some changes though that would be easy to apply separately, for example improvements to the log messages.

[JakobLichterfeld]

Agree, I do have trouble reviewing. The comments helped a bit.
As so much test cases fail I would love to see a split up by @micves on this branch.

[micves]

Not sure where the model2 changes are coming from. They are not in the original https://github.com/teslamate-org/teslamate/pull/3262/files Maybe it wasn't synced when this PR was made?

The commit history of the old #3262 is long and a bit messed up. Might be easier to only look at the end result. Which again as you mention is a bit complex :(
The issue is also complex as the length of #3084 also indicates.

The shortest way to sum it up, might actually just be the description I made on fake_online_state variable:

fake_online_state is introduced because older cars upgraded to MCU2 have a little wakeup every hour to check subsystems.
They report online but if vehicle_data is requested they wake up completely (cars clicks) and is awake for
15 minutes instead of a 2-3 minutes. The only difference (known at this moment) is that stream reports power=nil
in subsystem online and reports power as a number when it is a real online.

The complexity comes in because online all of a sudden might not be online.
It's Schrödinger's online until data from Stream is received :)

This means that the entire online state handling and stream is re-done, and the tests (or as I see it, the API mock used for tests) does not support the fact that a Stream is required.

The ultimate solution would be that the car or Tesla servers would hide the fake online.
I haven't checked in a while, but my guess is that nothing has changed there.