🐛 return a bit more verbosy error messages for go-package errors

[AlmogBaku]

When having sub-packages, and one of them is out of sync, we might get an error such as:

err: exit status 1: stderr: go: updates to go.mod needed; to update it:
        go mod tidy

Although this error is true, it was a nightmare to debug it and figure out that it was related to a sub-package.

This PR introduces a bit more verbosy error message that can help you to debug the issue:

Error: error in /Users/AlmogBaku/projects/myproject/subpackage: err: exit status 1: stderr: go: updates to go.mod needed; to update it:
        go mod tidy

[AlmogBaku]

might be related to #718

[camilamacedo86]

/lgtm

[AlmogBaku]

/assign @mengqiy

[deepankarm]

Any updates on when this PR can be merged? It indeed is a nightmare to debug.

[camilamacedo86]

The requested changes by @joelanford are addressed so we can :

/lgtm

[k8s-ci-robot]

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