Remove leading spaces of yarn run's answer

[pd4d10]

Summary

If user's answer contains leading spaces, the command will fail. Like:

> yarn run
...
question Which command would you like to run?:  start
error An unexpected error occurred: "Command \"\" not found.".

This PR add a trim operation to remove leading spaces

Test plan

[waleedahmed3045]

@pd4d10 its a good idea but i think its better to have strict check on the input of the user. I would prefer if error is more descriptive and specifies the full entry not just empty spaces :)

[arcanis]

I think it's fine - this syntax is only used from the command line and not by script, so from a DevX perspective it's better if we can be more tolerant on such mistakes.