gps: vcs repo error fix

[jmank88]

What does this do / why do we need it?

This PR refactors newVcsRemoteErrorOr and newVcsLocalErrorOr with the primary goal of fixing the bug of wrapping the error passed in and a secondary goal of drying up the usages.

What should your reviewer look out for in this PR?

Should we still wrap up the context errors, rather than return them bare?
There is a case context.Canceled, context.DeadlineExceeded: check for log suppression, otherwise I'm not sure the err needs to be bare.

[sdboyer]

Should we still wrap up the context errors, rather than return them bare?
There is a case context.Canceled, context.DeadlineExceeded: check for log suppression, otherwise I'm not sure the err needs to be bare.

without having looked at the actual code here, now that we've started using pkg/errors we need to be more diligent about calling errors.Cause() anywhere that we're doing error type/equality assertions.