test(generator/go): add an integration test for golang generation

[devoncarew]

• add an integration test for golang generation

When looking at adding a Dart backend, I'd copied the Go one (from a few days ago), but noticed that it was no longer working; the templates directory location had changed as well as several of the mustache variable names. This PR adds an integration test for the golang generator as a github workflow. It's not 100% functional, as the generation code doesn't go build:

# secretmanager
./client.go:1112:5: undefined: Metadata
./client.go:1147:17: undefined: Time
./client.go:1168:17: undefined: Time
./client.go:1171:10: undefined: Duration
./client.go:1213:24: undefined: Duration
...

but perhaps this test is useful as a start? The fixes are probably pretty straightforward for someone w/ more go experience.

[devoncarew]

From the CI failures it looks like I need to update the goldens for generator/testdata/go/protobuf/golden/iam/v1/go.mod. I can do that, but I'm wondering if I should use that api as the one to use for an integration test?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.61%. Comparing base (56c7a5b) to head (d070792).
Report is 28 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #961   +/-   ##
=======================================
  Coverage   95.61%   95.61%           
=======================================
  Files          36       36           
  Lines        1369     1369           
=======================================
  Hits         1309     1309           
  Misses         60       60           

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[devoncarew]

closing for now -