perf(cli): optimize CPU consumption of help pages (#9607)

This change reduces the CPU consumption of --help by ~50%.

Also, this change removes ANSI escape codes from our golden files. I
don't think those were worth the inability to parallelize golden file tests and
global state fragility.

cli/clitest/clitest.go

@@ -29,7 +29,7 @@ import (
 
 // New creates a CLI instance with a configuration pointed to a
 // temporary testing directory.
-func New(t *testing.T, args ...string) (*clibase.Invocation, config.Root) {
+func New(t testing.TB, args ...string) (*clibase.Invocation, config.Root) {
 	var root cli.RootCmd
 
 	cmd, err := root.Command(root.AGPL())
@@ -56,7 +56,7 @@ func (l *logWriter) Write(p []byte) (n int, err error) {
 }
 
 func NewWithCommand(
-	t *testing.T, cmd *clibase.Cmd, args ...string,
+	t testing.TB, cmd *clibase.Cmd, args ...string,
 ) (*clibase.Invocation, config.Root) {
 	configDir := config.Root(t.TempDir())
 	logger := slogtest.Make(t, nil)

cli/clitest/golden.go

@@ -11,11 +11,9 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/muesli/termenv"
 	"github.com/stretchr/testify/require"
 
 	"github.com/coder/coder/v2/cli/clibase"
-	"github.com/coder/coder/v2/cli/cliui"
 	"github.com/coder/coder/v2/cli/config"
 	"github.com/coder/coder/v2/coderd/coderdtest"
 	"github.com/coder/coder/v2/coderd/database/dbtestutil"
@@ -50,12 +48,8 @@ func DefaultCases() []CommandHelpCase {
 
 // TestCommandHelp will test the help output of the given commands
 // using golden files.
-//
-//nolint:tparallel,paralleltest
 func TestCommandHelp(t *testing.T, getRoot func(t *testing.T) *clibase.Cmd, cases []CommandHelpCase) {
-	// ANSI256 escape codes are far easier for humans to parse in a diff,
-	// but TrueColor is probably more popular with modern terminals.
-	cliui.TestColor(t, termenv.ANSI)
+	t.Parallel()
 	rootClient, replacements := prepareTestData(t)
 
 	root := getRoot(t)