[feature-request] rover output to a folder doesn't exist

When we use the command rover -a output to a folder that doesn't exist, it doesnt automatically created. This doesn't happen with plan as it will create the folder automatically.

We can consider doing the same for output.

Start by locating the rover command handling for `-a output`, then compare its missing-folder behavior with the existing `plan` path. Done means output creates a folder that does not yet exist, matching the behavior described for plan; check the relevant existing command checks if available.

Written by the indexing model from the issue text.