chore(test): update FluentAssertions from 6.12.0 to 7.2.0

[Flash0ver]

Changes

• Update FluentAssertions from 6.12.0 to 7.2.0
  • but not 8.*
    • 8.0.0 changed the license from Apache-2.0 to a custom license that we should check by legal first
  • 7.2.0 uses the [NotNullAttribute]
    • we should be able to clean up some nullable suppressions
• Add FluentAssertions.Analyzers
  • License: MIT

Potential follow-ups (after merge to main)

• Enable Nullable Reference Types for all Test-Projects
• Remove now redundant Nullable Suppressions and Null-Conditional-Access

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.82%. Comparing base (35aaef9) to head (64a338f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4864      +/-   ##
==========================================
- Coverage   73.92%   73.82%   -0.10%     
==========================================
  Files         483      483              
  Lines       17551    17551              
  Branches     3461     3461              
==========================================
- Hits        12974    12957      -17     
- Misses       3721     3742      +21     
+ Partials      856      852       -4     

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[Flash0ver]

note:

error CS0104: 'NetworkAccess' is an ambiguous reference between 'System.Net.NetworkAccess' and 'Microsoft.Maui.Networking.NetworkAccess'

dependency graph for net10.0 and net9.0

• FluentAssertions 6.12.0
  • System.Configuration.ConfigurationManager (>= 4.4.0)
    • System.Security.Cryptography.ProtectedData (>= 4.4.0)
• FluentAssertions 7.2.0
  • System.Configuration.ConfigurationManager (>= 6.0.0)
    • System.Security.Cryptography.ProtectedData (>= 6.0.0)
    • System.Security.Permissions (>= 6.0.0)
      • System.Security.AccessControl (>= 6.0.0)
      • System.Windows.Extensions (>= 6.0.0)
        • System.Drawing.Common (>= 6.0.0)
          • Microsoft.Win32.SystemEvents (>= 6.0.0)