Upgrade app to latest Spezi releases

[Supereg]

Upgrade app to latest Spezi releases

♻️ Current situation & Problem

This PR migrates the template app to use the new Observable framework. Further it updates the template app to the latest releases of the Spezi framework ecosystem.

⚙️ Release Notes

• Update to the latest Spezi releases
• Migrate to Observable

📚 Documentation

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✅ Testing

• UI tests were updated and adjusted.

📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

Merging #56 (a78b8a6) into main (a7a84e4) will decrease coverage by 2.08%.
The diff coverage is 47.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   82.58%   80.50%   -2.08%     
==========================================
  Files          35       33       -2     
  Lines         987      938      -49     
==========================================
- Hits          815      755      -60     
- Misses        172      183      +11     

Files	Coverage Δ
...mplateApplication/Account/AccountSetupHeader.swift	100.00% <ø> (ø)
TemplateApplication/Account/AccountSheet.swift	95.66% <ø> (-2.17%)	⬇️
TemplateApplication/Home.swift	100.00% <100.00%> (ø)
TemplateApplication/MockUpload/MockUpload.swift	92.31% <ø> (ø)
...lateApplication/Onboarding/AccountOnboarding.swift	88.89% <ø> (ø)
TemplateApplication/Onboarding/Consent.swift	94.12% <ø> (ø)
...eApplication/Onboarding/HealthKitPermissions.swift	95.56% <ø> (ø)
...ateApplication/Onboarding/InterestingModules.swift	100.00% <ø> (ø)
...plication/Onboarding/NotificationPermissions.swift	95.56% <ø> (ø)
...emplateApplication/Onboarding/OnboardingFlow.swift	97.23% <ø> (ø)
... and 5 more

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[PSchmiedmayer]

Thank you for all the updates and improvements, those look great @Supereg! 🚀