Merge branch 'dev/7.0.0' into xamlIslandFixes

Author: Kyaa-dost

UnitTests/UnitTests.HighPerformance.Shared/Extensions/Test_ReadOnlySpanExtensions.Count.cs

@@ -62,7 +62,12 @@ public void Test_ReadOnlySpanExtensions_RandomCountManaged()
         {
             var value = new Int(37438941);
 
-            foreach (var count in TestCounts)
+            // We can skip the most expensive test in this case, as we're not testing
+            // a SIMD enabled path. The last test requires a very high memory usage which
+            // sometimes causes the CI test runner to fail with an out of memory exception.
+            // Since we don't need to double check overflows in the managed case, which is
+            // just a classic linear loop with some optimizations, omitting this case is fine.
+            foreach (var count in TestCounts.Slice(0, TestCounts.Length - 1))
             {
                 var random = new Random(count);