Switch cmd/ to use constructor functions. (#36962)

This is a step towards potentially splitting command groups into their
own folders to clean up `cmd/` as one folder for all cli commands.
Returning fresh command instances will also aid in adding tests as you
don't need to concern yourself with the whole command tree being one
mutable variable.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

cmd/admin_user_generate_access_token.go

@@ -14,32 +14,34 @@ import (
 	"github.com/urfave/cli/v3"
 )
 
-var microcmdUserGenerateAccessToken = &cli.Command{
-	Name:  "generate-access-token",
-	Usage: "Generate an access token for a specific user",
-	Flags: []cli.Flag{
-		&cli.StringFlag{
-			Name:    "username",
-			Aliases: []string{"u"},
-			Usage:   "Username",
+func newUserGenerateAccessTokenCommand() *cli.Command {
+	return &cli.Command{
+		Name:  "generate-access-token",
+		Usage: "Generate an access token for a specific user",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:    "username",
+				Aliases: []string{"u"},
+				Usage:   "Username",
+			},
+			&cli.StringFlag{
+				Name:    "token-name",
+				Aliases: []string{"t"},
+				Usage:   "Token name",
+				Value:   "gitea-admin",
+			},
+			&cli.BoolFlag{
+				Name:  "raw",
+				Usage: "Display only the token value",
+			},
+			&cli.StringFlag{
+				Name:  "scopes",
+				Value: "all",
+				Usage: `Comma separated list of scopes to apply to access token, examples: "all", "public-only,read:issue", "write:repository,write:user"`,
+			},
 		},
-		&cli.StringFlag{
-			Name:    "token-name",
-			Aliases: []string{"t"},
-			Usage:   "Token name",
-			Value:   "gitea-admin",
-		},
-		&cli.BoolFlag{
-			Name:  "raw",
-			Usage: "Display only the token value",
-		},
-		&cli.StringFlag{
-			Name:  "scopes",
-			Value: "all",
-			Usage: `Comma separated list of scopes to apply to access token, examples: "all", "public-only,read:issue", "write:repository,write:user"`,
-		},
-	},
-	Action: runGenerateAccessToken,
+		Action: runGenerateAccessToken,
+	}
 }
 
 func runGenerateAccessToken(ctx context.Context, c *cli.Command) error {