chore: avoid concurrent usage of t.FailNow (#1683)

* chore: golangci: add linter rule to report usage of t.FailNow inside goroutines
* chore: avoid t.FailNow in goroutines to appease the race detector

cli/usercreate_test.go

@@ -3,7 +3,7 @@ package cli_test
 import (
 	"testing"
 
-	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/assert"
 
 	"github.com/coder/coder/cli/clitest"
 	"github.com/coder/coder/coderd/coderdtest"
@@ -25,7 +25,7 @@ func TestUserCreate(t *testing.T) {
 		go func() {
 			defer close(doneChan)
 			err := cmd.Execute()
-			require.NoError(t, err)
+			assert.NoError(t, err)
 		}()
 		matches := []string{
 			"Username", "dean",