fix: Disable telemetry by default in tests (#3200)

I also noticed we don't have `goleak` enabled for CLI tests, this commit
adds it, but commented out. The reason being that we're nowhere near
being able to enable it yet.

Co-authored-by: Cian Johnston <cian@coder.com>

cli/root_internal_test.go

@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -64,3 +65,9 @@ func Test_formatExamples(t *testing.T) {
 		})
 	}
 }
+
+func TestMain(m *testing.M) {
+	// Replace with goleak.VerifyTestMain(m) when we enable goleak.
+	os.Exit(m.Run())
+	// goleak.VerifyTestMain(m)
+}