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

enterprise/coderd/coderdenttest/coderdenttest.go

@@ -15,7 +15,6 @@ import (
 
 	"github.com/golang-jwt/jwt/v4"
 	"github.com/google/uuid"
-	"github.com/moby/moby/pkg/namesgenerator"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -24,6 +23,7 @@ import (
 	"github.com/coder/coder/v2/coderd/database"
 	"github.com/coder/coder/v2/coderd/database/pubsub"
 	"github.com/coder/coder/v2/coderd/prebuilds"
+	"github.com/coder/coder/v2/coderd/util/namesgenerator"
 	"github.com/coder/coder/v2/coderd/util/ptr"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/codersdk/drpcsdk"
@@ -328,9 +328,9 @@ type CreateOrganizationOptions struct {
 func CreateOrganization(t *testing.T, client *codersdk.Client, opts CreateOrganizationOptions, mutators ...func(*codersdk.CreateOrganizationRequest)) codersdk.Organization {
 	ctx := testutil.Context(t, testutil.WaitMedium)
 	req := codersdk.CreateOrganizationRequest{
-		Name:        strings.ReplaceAll(strings.ToLower(namesgenerator.GetRandomName(0)), "_", "-"),
-		DisplayName: namesgenerator.GetRandomName(1),
-		Description: namesgenerator.GetRandomName(1),
+		Name:        strings.ToLower(namesgenerator.UniqueNameWith("-")),
+		DisplayName: namesgenerator.UniqueName(),
+		Description: namesgenerator.UniqueName(),
 		Icon:        "",
 	}
 	for _, mutator := range mutators {

enterprise/coderd/coderdenttest/proxytest.go

@@ -12,12 +12,12 @@ import (
 	"sync"
 	"testing"
 
-	"github.com/moby/moby/pkg/namesgenerator"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"cdr.dev/slog/v3"
+	"github.com/coder/coder/v2/coderd/util/namesgenerator"
 	"github.com/coder/coder/v2/coderd/workspaceapps/appurl"
 	"github.com/coder/coder/v2/codersdk"
 	"github.com/coder/coder/v2/enterprise/coderd"
@@ -124,7 +124,7 @@ func NewWorkspaceProxyReplica(t *testing.T, coderdAPI *coderd.API, owner *coders
 	}
 
 	if options.Name == "" {
-		options.Name = namesgenerator.GetRandomName(1)
+		options.Name = namesgenerator.UniqueName()
 	}
 
 	token := options.Token