Add a banner that offers the user to transition to native sliding sync

[stefanceriu]

This PR introduces the following logic to support migrating users to native sliding sync

• if the user is logged in and using native SS then perfect, nothing to do
• if using a proxy then:
  • if native is available as advertised through /versions a banner will be shown to prompt logout
  • if the proxy is no longer available as advertised through .well-known then force logout

Fixes #3258

[github-actions]

	Fails
🚫	Please provide a complete title that can be used as a changelog entry.

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	You seem to have made changes to views. Please consider adding screenshots.

Generated by 🚫 Danger Swift against 864a665

[Velin92]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 60.48387% with 49 lines in your changes missing coverage. Please review.

Project coverage is 71.04%. Comparing base (5394523) to head (864a665).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...urces/Screens/HomeScreen/HomeScreenViewModel.swift	32.72%	37 Missing ⚠️
.../FlowCoordinators/UserSessionFlowCoordinator.swift	0.00%	4 Missing ⚠️
...ces/Screens/HomeScreen/HomeScreenCoordinator.swift	0.00%	4 Missing ⚠️
...en/View/HomeScreenSlidingSyncMigrationBanner.swift	93.75%	3 Missing ⚠️
...es/Screens/HomeScreen/View/HomeScreenContent.swift	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3252      +/-   ##
===========================================
- Coverage    71.05%   71.04%   -0.02%     
===========================================
  Files          734      735       +1     
  Lines        65131    65234     +103     
===========================================
+ Hits         46279    46345      +66     
- Misses       18852    18889      +37     

Flag	Coverage Δ
unittests	68.82% <60.48%> (+0.02%)	⬆️

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud