Improving silent errors on checking and submission

[ermolushka]

pretty_print_submit_response was silently dropping

RUNTIME_ERROR, RATE_LIMIT_EXCEEDED, TOO_MANY_REQUESTS, TIME_LIMIT_EXCEEDED, MEMORY_LIMIT_EXCEEDED, SANDBOX_TIMEOUT, SANDBOX_OUTPUT_LIMIT, OUTPUT_LIMIT_EXCEEDED

responses. The spinner would just hang or show no output.

• Added an explicit handler that surfaces the event type and error message.
• Added a finished flag so that if the stream ends without hitting any terminal event the CLI prints "No response received from server." instead of exiting silently.
• Added TOO_MANY_REQUESTS to the terminal-event matchers in pretty_print_checker_response and pretty_print_benchmark_response_v2, which were already handling the rest of the error family but missing this one.

Mentioned here as well