[Resources.ProcessRuntime] Allow preview versions

Update assertion to not fail if a preview or release candidate version of .NET is being used.

Author: martincostello

test/OpenTelemetry.Resources.ProcessRuntime.Tests/ProcessRuntimeDetectorTests.cs

@@ -21,7 +21,7 @@ public void TestProcessRuntimeAttributes()
         Assert.Equal(".NET Framework", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeName]);
         Assert.Matches(@"^4.[1-9](.[1-2])?$", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeVersion]);
 #else
-        Assert.Matches(@"^\.NET \d+\.\d+\.\d+$", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeDescription]);
+        Assert.Matches(@"^\.NET \d+\.\d+\.\d+(\-(preview|rc)\.\d+\.\d+\.\d+)?$", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeDescription]);
         Assert.Equal(".NET", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeName]);
         Assert.Matches(@"^\d+\.\d+\.\d+$", resourceAttributes[ProcessRuntimeSemanticConventions.AttributeProcessRuntimeVersion]);
 #endif