Remove redundant consistency tests as requested

Co-authored-by: nkolev92 <[email protected]>

Author: Copilot

test/NuGet.Core.Tests/NuGet.Common.Test/RuntimeEnvironmentHelperTests.cs

@@ -7,39 +7,6 @@ namespace NuGet.Common.Test
 {
     public class RuntimeEnvironmentHelperTests
     {
-        [Fact]
-        public void IsWindows_ShouldReturnConsistentValue()
-        {
-            // Arrange & Act
-            var result1 = RuntimeEnvironmentHelper.IsWindows;
-            var result2 = RuntimeEnvironmentHelper.IsWindows;
-
-            // Assert
-            Assert.Equal(result1, result2);
-        }
-
-        [Fact]
-        public void IsMacOSX_ShouldReturnConsistentValue()
-        {
-            // Arrange & Act
-            var result1 = RuntimeEnvironmentHelper.IsMacOSX;
-            var result2 = RuntimeEnvironmentHelper.IsMacOSX;
-
-            // Assert
-            Assert.Equal(result1, result2);
-        }
-
-        [Fact]
-        public void IsLinux_ShouldReturnConsistentValue()
-        {
-            // Arrange & Act
-            var result1 = RuntimeEnvironmentHelper.IsLinux;
-            var result2 = RuntimeEnvironmentHelper.IsLinux;
-
-            // Assert
-            Assert.Equal(result1, result2);
-        }
-
         [Fact]
         public void PlatformDetection_ShouldBeExclusive()
         {