[rust-compiler] Fix e2e diagnostic event mismatches (123→2 failures)

Fix 121 of 123 babel e2e test failures by aligning diagnostic event
output with the TypeScript compiler. Key changes: serialize description/
message fields as null (not omitted), implement diagnostic suggestions
with LoggerSuggestionOp enum, make record_error() return Result for
invariant short-circuiting, emit CompileUnexpectedThrow events, use
CompilerDiagnostic format for invariant errors, and emit CompileSuccess
events for JSX-outlined functions.