Add Vulkan triangle integration path

tests/RHI/integration/triangle/Res/Shader/triangle_vulkan.frag

@@ -0,0 +1,8 @@
+#version 450
+
+layout(location = 0) in vec4 vColor;
+layout(location = 0) out vec4 fragColor;
+
+void main() {
+    fragColor = vColor;
+}