Rename dev_runtime to browser_runtime (vercel/turborepo#8396)

### Description

Mirrors the changes from `get_dev_runtime_code` to `get_browser_runtime_code`, didn't rename the file back then.

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### Testing Instructions

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crates/turbopack-ecmascript-runtime/src/lib.rs

@@ -1,15 +1,15 @@
 #![feature(arbitrary_self_types)]
 
 pub(crate) mod asset_context;
+pub(crate) mod browser_runtime;
 pub(crate) mod build_runtime;
-pub(crate) mod dev_runtime;
 #[cfg(feature = "test")]
 pub(crate) mod dummy_runtime;
 pub(crate) mod embed_js;
 pub(crate) mod runtime_type;
 
+pub use browser_runtime::get_browser_runtime_code;
 pub use build_runtime::get_nodejs_runtime_code;
-pub use dev_runtime::get_browser_runtime_code;
 #[cfg(feature = "test")]
 pub use dummy_runtime::get_dummy_runtime_code;
 pub use embed_js::{embed_file, embed_file_path, embed_fs};