Encryption Flow Coordinators.

[pixlwave]

This PR is the next part needed for #3399:

The whole SecureBackup…/EncryptionReset… flow was intertwined, using the screen coordinators to perform navigation, manipulating the stack, and including some duplication between the Settings flow and the Onboarding flow. This PR makes the following changes:

• Build an EncryptionSettingsFlowCoordinator and a EncryptionResetFlowCoordinator which take all navigation responsibility away from the screens. They're based on state machines which now I'm done I realise is a bit overkill given by the end of the refactor they're both very simple, however now that those are in place it seems better to leave them for the future than remove them (e.g. EncryptionSettingsFlowCoordinator is going to get another section that I think is going to involve a bit more complex set up).
• Remove the reset flow from EncryptionSettingsFlowCoordinator as it turns out the view action for this was removed in Tweak the UI in the EncryptionReset, IdentityConfirmation and SecureBackupRecovery screens. #3391, but the view model upwards was left in place 🤦‍♂️
• Add UI tests for both flows to ensure presentation works as expected.

Sorry this grew so large, I can now see how it could have been split into 2 smaller PRs but that wasn't apparent until most of the refactor was done. It is split into reviewable commits though.

[github-actions]

	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 9092350

[sonarcloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 9.03427% with 292 lines in your changes missing coverage. Please review.

Project coverage is 77.72%. Comparing base (1f90f1a) to head (9092350).
Report is 3 commits behind head on develop.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ordinators/EncryptionSettingsFlowCoordinator.swift	0.00%	126 Missing ⚠️
...wCoordinators/EncryptionResetFlowCoordinator.swift	0.00%	93 Missing ⚠️
...s/FlowCoordinators/OnboardingFlowCoordinator.swift	0.00%	15 Missing ⚠️
...een/SecureBackupRecoveryKeyScreenCoordinator.swift	0.00%	14 Missing ⚠️
...ces/FlowCoordinators/SettingsFlowCoordinator.swift	0.00%	13 Missing ⚠️
...onResetScreen/EncryptionResetScreenViewModel.swift	0.00%	8 Missing ⚠️
...reBackupScreen/SecureBackupScreenCoordinator.swift	0.00%	4 Missing ⚠️
...een/EncryptionResetPasswordScreenCoordinator.swift	0.00%	3 Missing ⚠️
...creen/EncryptionResetPasswordScreenViewModel.swift	50.00%	3 Missing ⚠️
...creen/SecureBackupRecoveryKeyScreenViewModel.swift	0.00%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3471      +/-   ##
===========================================
- Coverage    77.90%   77.72%   -0.18%     
===========================================
  Files          744      745       +1     
  Lines        61427    61564     +137     
===========================================
- Hits         47853    47851       -2     
- Misses       13574    13713     +139     

Flag	Coverage Δ
unittests	69.43% <9.03%> (-0.08%)	⬇️

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