Improve error around failing to validate checksums

[robdimsdale]

Expected Behavior / Current Behavior

The error failed to validate dependency: checksum does not match is quite vague and potentially hides more useful errors around downloading dependencies e.g.

  Executing build process
    Installing Node Engine 18.14.1
validation error: checksum does not match
ERROR: failed to build: exit status 1 

It is found here.

I'm not sure if this is hiding errors, but I think it would be worth investigating. Regardless, we could improve the error message (e.g. to include the expected and actual checksums).