Make the SessionDirectories type responsible for cleaning up data.

[pixlwave]

Addresses the remaining comments from #3196

[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 9f58df6

[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

[codecov]

Codecov Report

Attention: Patch coverage is 90.38462% with 15 lines in your changes missing coverage. Please review.

Project coverage is 77.57%. Comparing base (ff5b22c) to head (9f58df6).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ources/Services/UserSession/UserSessionStore.swift	0.00%	6 Missing ⚠️
...rces/Services/UserSession/SessionDirectories.swift	88.88%	4 Missing ⚠️
NSE/Sources/Other/NSEUserSession.swift	0.00%	2 Missing ⚠️
...ervices/Authentication/AuthenticationService.swift	0.00%	1 Missing ⚠️
...Sources/Services/Keychain/KeychainController.swift	0.00%	1 Missing ⚠️
...X/Sources/Services/QRCode/QRCodeLoginService.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3261      +/-   ##
===========================================
+ Coverage    77.46%   77.57%   +0.10%     
===========================================
  Files          725      725              
  Lines        58509    58811     +302     
===========================================
+ Hits         45323    45621     +298     
- Misses       13186    13190       +4     

Flag	Coverage Δ
unittests	68.99% <90.38%> (+0.16%)	⬆️

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[stefanceriu]

Suuper nice cleanup! 👏