Disable sentry during test runs

Exposed to be running by 48434dd683 which
caused test failures.

You'd think that the `IsDeployedBuild` check would catch it but it
doesn't. `IsDeployedBuild` is `AssemblyVersion.Major > 0`, and the
assembly version is taken from the entry assembly. In tests the entry
assembly is either resharper or nunit.

osu.Game/Utils/SentryLogger.cs

@@ -14,6 +14,7 @@ using osu.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Configuration;
+using osu.Framework.Development;
 using osu.Framework.Logging;
 using osu.Framework.Platform;
 using osu.Framework.Statistics;
@@ -49,6 +50,9 @@ namespace osu.Game.Utils
             if (Environment.GetEnvironmentVariable("OSU_DISABLE_ERROR_REPORTING") == "1")
                 return;
 
+            if (DebugUtils.IsNUnitRunning)
+                return;
+
             if (!game.IsDeployedBuild || !game.CreateEndpoints().WebsiteUrl.EndsWith(@".ppy.sh", StringComparison.Ordinal))
                 return;