Update on "[ET-VK] Replace Uniform buffers with push constants for copy op"

This diff replaces uniform buffers with push constants for copy op in the Vulkan backend of Executorch. The changes include updating the GLSL code to use push constants instead of uniform buffers and updating the C++ code to pass the sizes as push constants to the shader.

Differential Revision: [D66890851](https://our.internmc.facebook.com/intern/diff/D66890851/)

[ghstack-poisoned]

Author: trivedivivek

backends/vulkan/runtime/graph/ops/glsl/copy_channel_offset.glsl

@@ -22,10 +22,11 @@ layout(push_constant) uniform restrict Block {
   ivec4 out_sizes;
   ivec4 in_sizes;
   // Operates on (x, y, z) logical extents.
+  // channel_range is stored in range.w
   ivec4 range;
   // Analogus to range variable in copy. It defines the # of channel being
   // copied.
-  // channel_range is stored in range.w
+  // dst channel offset is stored in dst_offset.w
   ivec4 dst_offset;
   int src_channel_offset;
 };

backends/vulkan/runtime/graph/ops/impl/Copy.cpp

@@ -160,10 +160,8 @@ void add_copy_channel_offset_node(
         {graph.hashed_layout_of(out), graph.hashed_layout_of(in)},
         nullptr,
         {},
-        {PushConstantDataInfo(
-             t_out->get_uniform_data(), api::vTensor::Attribute::SIZES),
-         PushConstantDataInfo(
-             t_in->get_uniform_data(), api::vTensor::Attribute::SIZES),
+        {graph.sizes_pc_of(out),
+         graph.sizes_pc_of(in),
          PushConstantDataInfo(&range_params, sizeof(range_params)),
          PushConstantDataInfo(&offset_params, sizeof(offset_params)),
          PushConstantDataInfo(