fix module name for AssetPath shaders (#9186)

# Objective

AssetPath shader imports check if the shader is added using the path
without quotes. this causes them to be re-added even if already present,
which can cause previous dependents to get unloaded leading to a
"missing import" error.

## Solution

fix the module name of AssetPath shaders used for checking if it's
already added to correctly use the quoted name.

crates/bevy_render/src/render_resource/pipeline_cache.rs

@@ -214,7 +214,7 @@ impl ShaderCache {
  shaders: &HashMap<Handle<Shader>, Shader>,
  import: &ShaderImport,
  ) -> Result<(), PipelineCacheError> {
- if !composer.contains_module(import.as_str()) {
+ if !composer.contains_module(&import.module_name()) {
  if let Some(shader_handle) = import_path_shaders.get(import) {
  if let Some(shader) = shaders.get(shader_handle) {
  for import in &shader.imports {
@@ -366,7 +366,8 @@ impl ShaderCache {
  shaders_to_clear.extend(data.dependents.iter().map(|h| h.clone_weak()));
 
  if let Some(Shader { import_path, .. }) = self.shaders.get(&handle) {
- self.composer.remove_composable_module(import_path.as_str());
+ self.composer
+ .remove_composable_module(&import_path.module_name());
  }
  }
  }

crates/bevy_render/src/render_resource/shader.rs

@@ -303,9 +303,10 @@ pub enum ShaderImport {
 }
 
 impl ShaderImport {
- pub fn as_str(&self) -> &str {
+ pub fn module_name(&self) -> Cow<'_, String> {
  match self {
- ShaderImport::AssetPath(s) | ShaderImport::Custom(s) => s,
+ ShaderImport::AssetPath(s) => Cow::Owned(format!("\"{s}\"")),
+ ShaderImport::Custom(s) => Cow::Borrowed(s),
  }
  }
 }