Better error messages for Pipelines.

Pipelines should throw some handled error messages for simple requests such as failed to push due to Branch permissions or failed to clone due to no access to the repo (mainly error messages that relate to BItbucket in some sort of way).

Such error messages should be something like "Failed to push changes due to no branch permissions" or "You don't have access to the remote repository you are trying to clone".

These errors should be thrown on build time when a build has failed because of such errors. Today it seems that the error messages are somewhat unclear.