Fix Tesla update showing scheduled updates as installing

[ptarjan]

When a Tesla software update is scheduled for later (e.g., tonight), the update entity was incorrectly showing as "Installing" because the SCHEDULED status was being treated the same as INSTALLING.

This change:

1. Makes in_progress only true when the status is INSTALLING
2. Adds an update_status attribute to show the actual API status (available, scheduled, installing, downloading, etc.)
3. Shows "Update scheduled" in the release_summary when scheduled, making it visible in the update card UI

Users can now clearly see when an update is scheduled vs installing.

In my current HA I see this when I have scheduled the update:

Breaking change

Proposed change

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[home-assistant]

Hey there @Bre77, mind taking a look at this pull request as it has been labeled with an integration (tesla_fleet) you are listed as a code owner for? Thanks!

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[Bre77]

Yeah I know exactly what's wrong here. PR incoming.

[Bre77]

Actually the problem is if scheduled isn't in progress then when you click install nothing will happen because it always goes scheduled for a minute before starting.

Would it be okay to be in progress but with 0%?

[ptarjan]

Sorry if I wasn't clear. My issue is on my car I pressed the Schedule Update button and scheduled it for 3am tomorrow morning. Now all day my Home Assistant is telling me the update is Installing... and at 10% as per the screenshot. I'd like it to not show that and just list it as scheduled all day.