GoogleAdsError and GoogleAdsFailure disappear on v7

[Zikoel]

This is currently blocked as we're waiting on a reply from Google regarding the removal of the GoogleAdsError and GoogleAdsFailure objects, which we make use of for error handling internally in the library. We'll keep this PR updated when we hear back.

Originally posted by @kritzware in #271 (comment)

Just to understand whats happening (I will try but is very difficult to help you with lib internals especially with grpc autogenerated code), I see that this resources are on v7 protos as usual but not on the google-ads-node output so, the problem is on the generation step ?

[Zikoel]

After some digging I found this related issue maybe can help. The issue reporter say that the error was introduced on the version > 1.3.0 maybe (temporarily) is possible to regenerate the protos code with a previous version of the generator ?

[kritzware]

Thanks for looking into this yourself @Zikoel.

A few days ago we discovered it was probably due to a bug in gapic-generator-typescript and we sent a message over to our Google contacts, after which they confirmed the issue. The issue you linked is the correct one to follow, so we're just waiting on that to be resolved before finishing off the V7 upgrade PR.

[summer-ji-eng]

Thanks for the patient. This problem should be fix in googleapis/gapic-generator-typescript#878

[summer-ji-eng]

Shipped fixed PR in version 1.4.0. Thanks for the patience.

[kritzware]

Going to close this now the issue has been resolved and as we prepare the V7 release! Thanks again @summer-ji-eng 👍