Fix ATS tab status indicators

[Don-Vito]

1. Fix progress value not updated
2. Introduce TabStatus object and bind both TabHeaderControl and CommandPalette to it
3. Add support for read-only mode indicator

[Don-Vito]

@zadjii-msft - I missed the progress value in the original PR 😢

Instead of an interface I creates a TabStatus object and bind all controls to it.

Marked as draft, as for some reason the ATS bindings are sometimes not updated.

[zadjii-msft]

Yea so far I'm cool with what's here.

[Don-Vito]

@zadjii-msft - for some reasons nested bindings were not updating to me.. so I added a code in the TabPaletteItem that notifies changes on the entire status if one of the indicators changes. This should have no implications, but it is definitely annoying and feels like voodoo.

[Don-Vito]

@carlos-zamora - please take a look as well. There are some gaps I missed originally + I did something simpler to avoid properties duplication by now.

[carlos-zamora]

omg this is so much cleaner. Thank you!

[zadjii-msft]

[zadjii-msft]

Thanks for hoping on this so quickly. What a fun bit of polish ☺️

[ghost]

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[ghost]

🎉Windows Terminal Preview v1.7.572.0 has been released which incorporates this pull request.:tada:

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