add timeout to prime sandbox run

[kcoopermiller]

Note

Add optional --timeout/-t (seconds) to prime sandbox run, display it when set, and pass timeout to SandboxClient.execute_command.

• CLI (src/prime_cli/commands/sandbox.py):
  • Sandbox Run:
    • Add --timeout/-t option (seconds; default 300) to prime sandbox run.
    • Print provided timeout in command pre-run summary.
    • Update SandboxClient.execute_command call to use keyword args and pass working_dir, env, and new timeout.

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[JannikSt]

atm 300 is also our max - wdyt. change this also on gateway(s)?