Implement safe depth-stencil blit using stencil export extension (#4356)

* Implement safe depth-stencil blit using stencil export extension

* Delete depth-stencil blit with buffer path

Ryujinx.Graphics.Vulkan/Shaders/StencilBlitFragmentShaderSource.frag

@@ -0,0 +1,12 @@
+#version 450 core
+
+#extension GL_ARB_shader_stencil_export : require
+
+layout (binding = 0, set = 2) uniform isampler2D texStencil;
+
+layout (location = 0) in vec2 tex_coord;
+
+void main()
+{
+    gl_FragStencilRefARB = texture(texStencil, tex_coord).r;
+}