dev: build without custom build tags
Created by: keegancsmith
None of our go files specify the dev or delve build tag. It is possible a dependency specifies the delve tag, but I don't see any recommendation in the delve README about this. If it does, we can add back build tag support for delve. I think we originally added this tag back in the day for how we shipped delve support (predates OSS).
Depends on https://github.com/sourcegraph/sourcegraph/pull/18773