Add logo for wgsl (WebGPU Shading Language) (#26360)

Was dabbling on the shaders these past few days and felt like we could
have the WGSL logo. This is based on the logo found on the GPU Web
repository: https://github.com/gpuweb/gpuweb/tree/main/logo

Release Notes:

- N/A

crates/theme/src/icon_theme.rs

@@ -264,6 +264,7 @@ const FILE_SUFFIXES_BY_ICON_KEY: &[(&str, &[&str])] = &[
     ("vs_sln", &["sln"]),
     ("vs_suo", &["suo"]),
     ("vue", &["vue"]),
+    ("wgsl", &["wgsl"]),
     ("zig", &["zig"]),
 ];
 
@@ -348,6 +349,7 @@ const FILE_ICONS: &[(&str, &str)] = &[
     ("vs_sln", "icons/file_icons/file.svg"),
     ("vs_suo", "icons/file_icons/file.svg"),
     ("vue", "icons/file_icons/vue.svg"),
+    ("wgsl", "icons/file_icons/wgsl.svg"),
     ("zig", "icons/file_icons/zig.svg"),
 ];