Format all Rust sources and clean up repository checks (#57314)

## Why

Rust formatting should include source files that Cargo cannot discover, while keeping command lines within Windows limits.

## What changed

- Update `scripts/format.py` to discover tracked and non-ignored untracked Rust files with Git and invoke `rustfmt` in batches of 64 files. Use the workspace configuration and skip recursive child-module formatting.
- Pass `SystemDrive` and `LOCALAPPDATA` to Windows Bazel tests.
- Extend the spelling allowlist, remove a manifest feature exception, and clean up an unused import, an empty MCP scenario module, and its snapshot.

GitOrigin-RevId: c0d625fda9290ead6a63919325d65f7352abfa40

.github/scripts/verify_cargo_workspace_manifests.py

@@ -26,7 +26,6 @@ UTILITY_NAME_EXCEPTIONS = {
     "path-utils": "codex-utils-path",
 }
 MANIFEST_FEATURE_EXCEPTIONS = {
-    "codex-rs/code-mode/Cargo.toml": {"sandbox": ("v8/v8_enable_sandbox",)},
     "codex-rs/v8-poc/Cargo.toml": {"sandbox": ("v8/v8_enable_sandbox",)},
 }
 OPTIONAL_DEPENDENCY_EXCEPTIONS = set()