[ET-VK] Renaming slice_channel and slice_batch_height_width files to reflect change in its utility.

Pull Request resolved: #9137

This diff renames files `slice_batch_height_width.y*` to `slice_unpacked_dim.*` and `slice_channel.*` to `slice_packed_dim.*` to reflect the change in their utility after enabling all dim packing for slice op.
ghstack-source-id: 271070838
@exported-using-ghexport

Differential Revision: [D70919994](https://our.internmc.facebook.com/intern/diff/D70919994/)

Author: trivedivivek

backends/vulkan/runtime/graph/ops/glsl/slice_channel.glsl renamed to backends/vulkan/runtime/graph/ops/glsl/slice_packed_dim.glsl

@@ -1,4 +1,4 @@
-slice_channel:
+slice_packed_dim:
   parameter_names_with_default_values:
     DTYPE: float
     NDIM: 3
@@ -8,4 +8,4 @@ slice_channel:
       - VALUE: half
       - VALUE: float
   shader_variants:
-    - NAME: slice_channel
+    - NAME: slice_packed_dim

backends/vulkan/runtime/graph/ops/glsl/slice_channel.yaml renamed to backends/vulkan/runtime/graph/ops/glsl/slice_packed_dim.yaml

@@ -1,4 +1,4 @@
-slice_batch_height_width:
+slice_unpacked_dim:
   parameter_names_with_default_values:
     DTYPE: float
     NDIM: 3
@@ -7,4 +7,4 @@ slice_batch_height_width:
       - VALUE: half
       - VALUE: float
   shader_variants:
-    - NAME: slice_batch_height_width
+    - NAME: slice_unpacked_dim

backends/vulkan/runtime/graph/ops/glsl/slice_batch_height_width.glsl renamed to backends/vulkan/runtime/graph/ops/glsl/slice_unpacked_dim.glsl

@@ -83,7 +83,7 @@ void add_slice_tensor_copy_node(
   // if slice dim is the same as the packed dim, we can use the channel slice
   if (dim_index == packed_dim_idx) {
     // slice by channel
-    std::string kernel_name = "slice_channel";
+    std::string kernel_name = "slice_packed_dim";
     kernel_name.reserve(kShaderNameReserve);
     add_dtype_suffix(kernel_name, *t_out);
 
@@ -119,7 +119,7 @@ void add_slice_tensor_copy_node(
       in_channel_stride = utils::div_up_4(in_channel_stride);
     }
 
-    std::string kernel_name = "slice_batch_height_width";
+    std::string kernel_name = "slice_unpacked_dim";
     kernel_name.reserve(kShaderNameReserve);
     add_dtype_suffix(kernel_name, *t_out);