[Golang] Remove breakpad support from build since it can't be used

While breakpad symbols are created by the build, they aren't used on Fuchsia
for Go binary stack traces.  Remove the generation and uploading of them.

Change-Id: I46754df3f61c4263e9867ed2a6dd94c392a04889
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/948694
Reviewed-by: Francois Rousseau <frousseau@google.com>
Commit-Queue: Aaron Wood <aaronwood@google.com>