Display command that is being run

[ehuss]

It can be helpful if the full command that is being executed is displayed, which can help with debugging issues (such as #284).

I would recommend showing the command with --verbose, along with the environment variables that are set.

[MingweiSamuel]

Edit: Would be good for --verbose (or -vv) to show the output as well, possibly. It seems --prompt does that a bit, for some reason, #333

Currently trying to bisect a regression in rustc's error output that I found with trybuild, have no idea what cargo-bisect-rustc is doing but it says ERROR: the start of the range (nightly-2024-03-01) must not reproduce the regression even though manually running the command cargo +nightly-2024-03-01 test -p hydroflow --test surface_compile_fail passes as expected. Not sure if trybuild is using the right rust version with bisect. I guess I'll try using --prompt