Fix offline state issue in user sessions overview

[alfogrillo]

This PR fixes an inconsistency on the device manager main screen when the app is launched without an internet connection.

Previously: the current device session was arbitrarily shown as "unverified"
Now: the current device session is shown as "unknown"

Result

[codecov]

Codecov Report

Patch coverage: 83.33% and project coverage change: -0.15 ⚠️

Comparison is base (94d19d4) 12.36% compared to head (21670e4) 12.22%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7562      +/-   ##
===========================================
- Coverage    12.36%   12.22%   -0.15%     
===========================================
  Files         1648     1648              
  Lines       163581   163590       +9     
  Branches     67170    67156      -14     
===========================================
- Hits         20226    19992     -234     
- Misses      142690   142953     +263     
+ Partials       665      645      -20     

Flag	Coverage Δ
uitests	55.05% <ø> (-0.01%)	⬇️
unittests	6.06% <83.33%> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...w/Service/MatrixSDK/UserSessionsDataProvider.swift	44.73% <81.81%> (+4.43%)	⬆️
...ervice/MatrixSDK/UserSessionsOverviewService.swift	84.32% <100.00%> (ø)

... and 16 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[aringenbach]

LGTM