refactor: improve mutation score

[vbreuss]

Refactor some implementation details, to catch uncaught errors (see Stryker.NET):

• Allow null in IStorage.GetOrAddDrive to simplify the implementation
• Add tests for Notification.ExecuteWhileWaiting
• Extract getting the name for an AssemblyName to an extension method to allow testing it
• Avoid including the default value for int in the choices in the random tests
• Extract getting a shared IRandom instance from the IFileSystem to an extension method to allow testing it
• Fix the test for changing a disposed timer in .NET 8 or greater (it returns false instead of throwing an ObjectDisposedException)

[github-actions]

Stryker.NET mutation tested the changes in the pull request:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

This is addressed in release v3.1.1.