tests: dispose of resources, add tests for maintainer, and clean up mock names

src/SanctionsSearch.Worker.Tests/Integration/DatabaseTest.cs

@@ -25,6 +25,7 @@ public class DatabaseTest : IAsyncLifetime
   public virtual async Task DisposeAsync()
   {
     await _appDbContext.DisposeAsync();
+    _loggerFactory.Dispose();
 
     SqliteConnection.ClearAllPools();