fix: replace moby/moby namesgenerator with internal implementation (#21377)

Replace the external moby/moby/pkg/namesgenerator dependency with an
internal implementation using gofakeit/v7. The moby package has ~25k
unique name combinations, and with its retry parameter only adds a
random digit 0-9, giving ~250k possibilities. In parallel tests, this
has led to collisions (flakes).

The new internal API at coderd/util/namesgenerator eliminates the
external dependnecy and offers functions with explicit uniqueness
guarantees. This PR also consolidates fragmented name generation in a
few places to use the new package.

| Old (moby/moby)                     | New                    |
|-------------------------------------|------------------------|
| namesgenerator.GetRandomName(0)     | NameWith("_")          |
| namesgenerator.GetRandomName(>0)    | NameDigitWith("_")     |
| testutil.GetRandomName(t)           | UniqueName()           |
| testutil.GetRandomNameHyphenated(t) | UniqueNameWith("-")    |

namesgenerator package API:
- NameWith(delim): random name, not unique
- NameDigitWith(delim): random name with 1-9 suffix, not unique
- UniqueName(): guaranteed unique via atomic counter
- UniqueNameWith(delim): unique with custom delimiter

Names continue to be docker style `[adjective][delim][surname]`. Unique
names are truncated to 32 characters (preserving the numeric suffix) to
fit common name length limits in Coder.

Related test flakes:
https://github.com/coder/internal/issues/1212
https://github.com/coder/internal/issues/118
https://github.com/coder/internal/issues/1068

coderd/coderdtest/coderdtest.go

@@ -30,17 +30,17 @@ import (
 	"sync/atomic"
 	"testing"
 	"time"
-	"unicode"
 
 	"cloud.google.com/go/compute/metadata"
 	"github.com/fullsailor/pkcs7"
 	"github.com/go-chi/chi/v5"
 	"github.com/golang-jwt/jwt/v4"
 	"github.com/google/uuid"
-	"github.com/moby/moby/pkg/namesgenerator"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 	"golang.org/x/xerrors"
 	"google.golang.org/api/idtoken"
 	"google.golang.org/api/option"
@@ -80,6 +80,7 @@ import (
 	"github.com/coder/coder/v2/coderd/schedule"
 	"github.com/coder/coder/v2/coderd/telemetry"
 	"github.com/coder/coder/v2/coderd/updatecheck"
+	"github.com/coder/coder/v2/coderd/util/namesgenerator"
 	"github.com/coder/coder/v2/coderd/util/ptr"
 	"github.com/coder/coder/v2/coderd/webpush"
 	"github.com/coder/coder/v2/coderd/workspaceapps"
@@ -792,7 +793,7 @@ func AuthzUserSubject(user codersdk.User, orgID uuid.UUID) rbac.Subject {
 
 func createAnotherUserRetry(t testing.TB, client *codersdk.Client, organizationIDs []uuid.UUID, retries int, roles []rbac.RoleIdentifier, mutators ...func(r *codersdk.CreateUserRequestWithOrgs)) (*codersdk.Client, codersdk.User) {
 	req := codersdk.CreateUserRequestWithOrgs{
-		Email:           namesgenerator.GetRandomName(10) + "@coder.com",
+		Email:           namesgenerator.UniqueName() + "@coder.com",
 		Username:        RandomUsername(t),
 		Name:            RandomName(t),
 		Password:        "SomeSecurePassword!",
@@ -1556,37 +1557,15 @@ func NewAzureInstanceIdentity(t testing.TB, instanceID string) (x509.VerifyOptio
 		}
 }
 
-func RandomUsername(t testing.TB) string {
-	suffix, err := cryptorand.String(3)
-	require.NoError(t, err)
-	suffix = "-" + suffix
-	n := strings.ReplaceAll(namesgenerator.GetRandomName(10), "_", "-") + suffix
-	if len(n) > 32 {
-		n = n[:32-len(suffix)] + suffix
-	}
-	return n
+func RandomUsername(_ testing.TB) string {
+	return namesgenerator.UniqueNameWith("-")
 }
 
-func RandomName(t testing.TB) string {
-	var sb strings.Builder
-	var err error
-	ss := strings.Split(namesgenerator.GetRandomName(10), "_")
-	for si, s := range ss {
-		for ri, r := range s {
-			if ri == 0 {
-				_, err = sb.WriteRune(unicode.ToTitle(r))
-				require.NoError(t, err)
-			} else {
-				_, err = sb.WriteRune(r)
-				require.NoError(t, err)
-			}
-		}
-		if si < len(ss)-1 {
-			_, err = sb.WriteRune(' ')
-			require.NoError(t, err)
-		}
-	}
-	return sb.String()
+// RandomName returns a random name in title case (e.g. "Happy Einstein").
+func RandomName(_ testing.TB) string {
+	return cases.Title(language.English).String(
+		namesgenerator.NameWith(" "),
+	)
 }
 
 // Used to easily create an HTTP transport!