Upgrade the Rust toolchain to 1.99.1 (#61205)

## What changed

- Update the workspace, Bazel toolchain and lockfile, CI and release workflows, and Windows setup script from Rust `1.95.0` to `1.99.1`.
- Adapt Rust code to the updated toolchain and Clippy lints, including `try_update` for atomics, `as_chunks` for fixed-size slices, and targeted allowances for generated tonic services.
- Refresh the halfwidth sound mark rendering snapshot to use literal characters in debug output.

GitOrigin-RevId: 5852029f687436dc814c2bca68141ee1f4a67d49

codex-rs/utils/stream-parser/src/inline_hidden_tag.rs

@@ -92,7 +92,7 @@ where
             .iter()
             .map(|spec| longest_suffix_prefix_len(pending, spec.open))
             .max()
-            .map_or(0, std::convert::identity)
+            .unwrap_or(0)
     }
 
     fn push_visible_prefix(out: &mut StreamTextChunk<ExtractedInlineTag<T>>, pending: &str) {