Refactor to use urfave/cli/v2 (#25959)

Replace #10912

And there are many new tests to cover the CLI behavior

There were some concerns about the "option order in hook scripts"
(https://github.com/go-gitea/gitea/pull/10912#issuecomment-1137543314),
it's not a problem now. Because the hook script uses `/gitea hook
--config=/app.ini pre-receive` format. The "config" is a global option,
it can appear anywhere.

----

## ⚠️ BREAKING ⚠️

This PR does it best to avoid breaking anything. The major changes are:

* `gitea` itself won't accept web's options: `--install-port` / `--pid`
/ `--port` / `--quiet` / `--verbose` .... They are `web` sub-command's
options.
    * Use `./gitea web --pid ....` instead
* `./gitea` can still run the `web` sub-command as shorthand, with
default options
* The sub-command's options must follow the sub-command
* Before: `./gitea --sub-opt subcmd` might equal to `./gitea subcmd
--sub-opt` (well, might not ...)
    * After: only `./gitea subcmd --sub-opt` could be used
    * The global options like `--config` are not affected

cmd/hook.go

@@ -20,7 +20,7 @@ import (
 	repo_module "code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/setting"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 const (
@@ -29,12 +29,12 @@ const (
 
 var (
 	// CmdHook represents the available hooks sub-command.
-	CmdHook = cli.Command{
+	CmdHook = &cli.Command{
 		Name:        "hook",
 		Usage:       "Delegate commands to corresponding Git hooks",
 		Description: "This should only be called by Git",
 		Before:      PrepareConsoleLoggerLevel(log.FATAL),
-		Subcommands: []cli.Command{
+		Subcommands: []*cli.Command{
 			subcmdHookPreReceive,
 			subcmdHookUpdate,
 			subcmdHookPostReceive,
@@ -42,47 +42,47 @@ var (
 		},
 	}
 
-	subcmdHookPreReceive = cli.Command{
+	subcmdHookPreReceive = &cli.Command{
 		Name:        "pre-receive",
 		Usage:       "Delegate pre-receive Git hook",
 		Description: "This command should only be called by Git",
 		Action:      runHookPreReceive,
 		Flags: []cli.Flag{
-			cli.BoolFlag{
+			&cli.BoolFlag{
 				Name: "debug",
 			},
 		},
 	}
-	subcmdHookUpdate = cli.Command{
+	subcmdHookUpdate = &cli.Command{
 		Name:        "update",
 		Usage:       "Delegate update Git hook",
 		Description: "This command should only be called by Git",
 		Action:      runHookUpdate,
 		Flags: []cli.Flag{
-			cli.BoolFlag{
+			&cli.BoolFlag{
 				Name: "debug",
 			},
 		},
 	}
-	subcmdHookPostReceive = cli.Command{
+	subcmdHookPostReceive = &cli.Command{
 		Name:        "post-receive",
 		Usage:       "Delegate post-receive Git hook",
 		Description: "This command should only be called by Git",
 		Action:      runHookPostReceive,
 		Flags: []cli.Flag{
-			cli.BoolFlag{
+			&cli.BoolFlag{
 				Name: "debug",
 			},
 		},
 	}
 	// Note: new hook since git 2.29
-	subcmdHookProcReceive = cli.Command{
+	subcmdHookProcReceive = &cli.Command{
 		Name:        "proc-receive",
 		Usage:       "Delegate proc-receive Git hook",
 		Description: "This command should only be called by Git",
 		Action:      runHookProcReceive,
 		Flags: []cli.Flag{
-			cli.BoolFlag{
+			&cli.BoolFlag{
 				Name: "debug",
 			},
 		},