Improve error when local package has inconsistent dependency constraints

[zodern]

While updating a package for Meteor 3, I started seeing this error:

Error: inconsistent dependency constraint across unibuilds?

It was caused by the package having different constraints on montiapm:agent:

  api.use('montiapm:agent@2.44.2||3.0.0-beta.4');
  api.imply('montiapm:agent@2.44.2');

The error was not very helpful in figuring this out. The code is able to show a much better message, but it was disabled when running for local packages. This PR re-enables it:

=> Errors while initializing project:         
                                              
While reading package from `...`:
error: The version constraint for a dependency must be the same at every place it is mentioned in a
package. 'montiapm:agent' is constrained both as 2.44.2||3.0.0-beta.4 and 2.44.2. Change them to match.

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