Improve Precision to 10 microseconds in timespan (dotnet/coreclr#24279)

* Increasing precision properly and leaving the rounding of to casting operator

* disabling corefx tests in coreclr and addressing feedback

* correcting test project name

* Fix json

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

netcore/System.Private.CoreLib/shared/System/TimeSpan.cs

@@ -196,7 +196,7 @@ public int CompareTo(TimeSpan value)
 
         public static TimeSpan FromDays(double value)
         {
-            return Interval(value, MillisPerDay);
+            return Interval(value, TicksPerDay);
         }
 
         public TimeSpan Duration()
@@ -232,28 +232,27 @@ public override int GetHashCode()
 
         public static TimeSpan FromHours(double value)
         {
-            return Interval(value, MillisPerHour);
+            return Interval(value, TicksPerHour);
         }
 
-        private static TimeSpan Interval(double value, int scale)
+        private static TimeSpan Interval(double value, double scale)
         {
             if (double.IsNaN(value))
                 throw new ArgumentException(SR.Arg_CannotBeNaN);
-            double tmp = value * scale;
-            double millis = tmp + (value >= 0 ? 0.5 : -0.5);
-            if ((millis > long.MaxValue / TicksPerMillisecond) || (millis < long.MinValue / TicksPerMillisecond))
+            double millis = value * scale;
+            if ((millis > long.MaxValue) || (millis < long.MinValue))
                 throw new OverflowException(SR.Overflow_TimeSpanTooLong);
-            return new TimeSpan((long)millis * TicksPerMillisecond);
+            return new TimeSpan((long)millis);
         }
 
         public static TimeSpan FromMilliseconds(double value)
         {
-            return Interval(value, 1);
+            return Interval(value, TicksPerMillisecond);
         }
 
         public static TimeSpan FromMinutes(double value)
         {
-            return Interval(value, MillisPerMinute);
+            return Interval(value, TicksPerMinute);
         }
 
         public TimeSpan Negate()
@@ -265,7 +264,7 @@ public TimeSpan Negate()
 
         public static TimeSpan FromSeconds(double value)
         {
-            return Interval(value, MillisPerSecond);
+            return Interval(value, TicksPerSecond);
         }
 
         public TimeSpan Subtract(TimeSpan ts)