NET-3640 Fix S3400 FP: Don't report function with conditional compilation body

[tkouba]

Description

On multi-platform or multi-target code, sometimes need to return constant on some platforms/targets.

Reproducer

        public static bool IsGooglePlayServicesAvailable()
        {
#if ANDROID
            try
            {
                var context = Android.App.Application.Context;
                var result = Android.Gms.Common.GoogleApiAvailability.Instance
                    .IsGooglePlayServicesAvailable(context);

                return result == Android.Gms.Common.ConnectionResult.Success;
            }
            catch
            {
                return false;
            }
#else
            // iOS / Windows platform fallback 
            return false;
#endif
        }

Product and Version

VisualStudio: 17.14.29, SonarQube ide 9.9.0.16495

[pavel-mikula-sonarsource]

Aho Tomáši,

Thank you for reporting this case, I confirm it as a False Positive.

[github-actions]

Internal ticket NET-3640