Split up TorConnectionAssistViewModel for better readibility and performance.

Summary

Summarize the bug encountered concisely.

Instead of having big view models that do a lot and are always loaded, we should have small viewmodels that do more specific things and are loaded as needed

torConnectionAssistViewModel.handleConnect
torConnectionAssistViewModel.urlToLoadAfterConnecting
torConnectionAssistViewModel.progress() (for if/when we make the progress bar show on all screens instead of just the bootstrap screen)

Edited Feb 11, 2025 by clairehurst

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