feat: suppress log package logging (runatlantis#3076)

To suppress uber-go/tally logs which are not structured logs.

Author: krrrr38

server/controllers/events/events_controller_e2e_test.go

@@ -1063,6 +1063,7 @@ func setupE2E(t *testing.T, repoDir string, opt setupOption) (events_controllers
 	projectCmdOutputHandler := jobmocks.NewMockProjectCommandOutputHandler()
 
 	// Real dependencies.
+	logging.SuppressDefaultLogging()
 	logger := logging.NewNoopLogger(t)
 
 	eventParser := &events.EventParser{

server/logging/log.go

@@ -0,0 +1,12 @@
+package logging
+
+import (
+	"io"
+	"log"
+)
+
+// SuppressDefaultLogging suppresses the default logging
+func SuppressDefaultLogging() {
+	// Some packages use the default logger, so we need to suppress it. (such as uber-go/tally)
+	log.SetOutput(io.Discard)
+}

server/server.go

@@ -153,6 +153,7 @@ type WebhookConfig struct {
 // its dependencies an error will be returned. This is like the main() function
 // for the server CLI command because it injects all the dependencies.
 func NewServer(userConfig UserConfig, config Config) (*Server, error) {
+	logging.SuppressDefaultLogging()
 	logger, err := logging.NewStructuredLoggerFromLevel(userConfig.ToLogLevel())
 
 	if err != nil {