[forge] accept and ignore "-Z unstable-options" and "--show-output"
[forge] accept and ignore "-Z unstable-options" and "--show-output"

My IDE insists to add these options while start debugging tests, so I'm adding these much like the existing NO-OP options, like test_threads, to the forge runner option.

Closes: #10149

aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra