[rust-compiler] Bail out on nested TypeScript `this` parameters (#37232)

## Summary Propagate errors returned while lowering block statements instead of discarding them and continuing with partially built HIR. The original issue was triggered by the SWC path, where a TypeScript `this` pseudo-parameter remains in the AST but is omitted from `ScopeInfo`. Lowering rejects the AST parameter, but the function-body block wrapper previously swallowed that error and returned a partial function. ```ts function Component() { useEffect(() => { const get = (): Val => { window.value = { count: 0, method(this: Val) {}, }; return window.value; }; get().count++; }, []); } ``` This could emit a partial transform with the assignment removed: ```js function Component() { useEffect(() => { const get = () => { return window.value; }; get().count++; }, []); } ``` ## How did you test this change? Added a [source-level reproduction against the SWC adapter](https://github.com/wbinnssmith/swc/blob/114e9c55b2/crates/swc_ecma_react_compiler/src/tests/integration.rs#L1563-L1591) using the same case above. - With the current lowering crate, the test fails because the adapter emits a partial program. - With this change patched into the lowering dependency, the test passes because compilation bails out. - `cargo test --manifest-path compiler/Cargo.toml -p react_compiler_lowering`