Use a Client in AuthenticationService now that the Rust one has been removed.

[pixlwave]

Rust's AuthenticationService has been removed in matrix-org/matrix-rust-sdk#3594. This PR moves what was very simple logic that called into a Client directly into our app-side AuthenticationService.

Can be reviewed commit-by-commit.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against e38d5d4

[sonarqubecloud]

Quality Gate passed

Issues
2 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

[Velin92]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 1.06383% with 93 lines in your changes missing coverage. Please review.

Project coverage is 78.23%. Comparing base (fc0573a) to head (e38d5d4).

Files	Patch %	Lines
...ervices/Authentication/AuthenticationService.swift	0.00%	38 Missing ⚠️
...mentX/Sources/Other/Extensions/ClientBuilder.swift	0.00%	20 Missing ⚠️
ElementX/Sources/Application/AppCoordinator.swift	0.00%	9 Missing ⚠️
...X/Sources/Services/QRCode/QRCodeLoginService.swift	0.00%	8 Missing ⚠️
...s/Authentication/OIDCAuthenticationPresenter.swift	0.00%	6 Missing ⚠️
...ources/Services/UserSession/UserSessionStore.swift	0.00%	4 Missing ⚠️
NSE/Sources/Other/NSEUserSession.swift	0.00%	4 Missing ⚠️
...ntication/LoginScreen/LoginScreenCoordinator.swift	0.00%	1 Missing ⚠️
...ctionScreen/ServerSelectionScreenCoordinator.swift	0.00%	1 Missing ⚠️
...SoftLogoutScreen/SoftLogoutScreenCoordinator.swift	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2954      +/-   ##
===========================================
- Coverage    78.45%   78.23%   -0.22%     
===========================================
  Files          691      694       +3     
  Lines        54047    54172     +125     
===========================================
- Hits         42405    42384      -21     
- Misses       11642    11788     +146     

Flag	Coverage Δ
unittests	68.82% <1.06%> (-0.17%)	⬇️

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