android: add selection of included/excluded apps in split tunneling

[davfsa]

Hello!

I took a stab at adding the ability to select included/excluded apps from App Split Tunneling instead of only allowing selecting excluded applications.

Included apps view	Excluded apps view	Selected apps reset alert

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A couple of points:

• DISALLOWED_APPS_KEY (now SELECTED_APPS_KEY) is in a bit of a weird situation as the value no longer represents the variable name. I havent opted to add a migration flow for the key, but can be done if needed. For now I have just added a comment above explaining the the reason
• switchUserSelectedPackages is not the best of names, but I couldn't come up with any better, will update with any suggestions or if I come up with a better one
• This is my first real work with Android JetPack and Android in general, so if there are any rookie mistakes, that would be why 🙃. If anything needs to be changed, I will get to it as soon as possible!

Closes tailscale/tailscale#14660

[review-ai-agent]

Pull Request Revisions

Revision	Description
r4	Log level and package name updates Modified log levels, replaced hardcoded package name with BuildConfig.APPLICATION_ID, and corrected log messages in several files
r3	Refactored package name references Replaced BuildConfig.APPLICATION_ID with hardcoded "com.tailscale.ipn" string and updated related logging messages
r2	Replaced hardcoded package name references Updated multiple source files to use BuildConfig.APPLICATION_ID instead of hardcoded "com.tailscale.ipn" package name references
r1	Enhanced app split tunneling functionality Refactored split tunneling to support both include and exclude app routing modes, with new toggle and warning dialog functionality

✅ AI review completed for r4

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[davfsa]

Hey @barnstar, sorry for the ping, but its been a little while, would it be possible to get a review?

Thanks! And again, sorry for the ping!