android: touchless auth key login

[barnstar]

updates tailscale/corp#29482

If an authKey is detected in the mdm payload, we will now skip the onboarding flows and several of the other non-mandatory permission prompts.

[review-ai-agent]

Pull Request Revisions

Revision	Description
r7	Inverted permission prompt logic condition Modified PromptForMissingPermissions function to change condition from !viewModel.skipPromptsForAuthKeyLogin() to viewModel.skipPromptsForAuthKeyLogin()
r6	Enhanced auth key login prompt check Modified skipPromptsForAuthKeyLogin() to check for non-empty auth key value, improving validation logic
r5	Added MDM settings update logic Integrated RestrictionsManager to update MDM settings within the application launch scope
r4	Renamed methods for clarity Renamed several methods to improve semantic clarity, including permission and onboarding-related function names
r3	Modified onboarding and permissions flow Updated MainActivity and MainViewModel to conditionally skip user permissions and onboarding based on MDM settings and auth key presence
r2	Added MDM settings update logic Retrieves RestrictionsManager and updates MDM settings before checking for MDM authentication key
r1	MDM login skips onboarding and permissions Added logic to skip onboarding and user-interactive permission prompts when MDM authentication key is present

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[kari-ts]

what is the right taildrop behavior in the touchless case? select no directory because they will never use taildrop, or select one for them?

[barnstar]

I think we just leave it for now and the user can select a directory. This primarily intended for POS terminals where taildrop (and the UI really) isn't intended to get used.