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/restore_repo.go

@@ -9,38 +9,39 @@ import (
 	"code.gitea.io/gitea/modules/private"
 	"code.gitea.io/gitea/modules/setting"
 
-	"github.com/urfave/cli"
+	"github.com/urfave/cli/v2"
 )
 
 // CmdRestoreRepository represents the available restore a repository sub-command.
-var CmdRestoreRepository = cli.Command{
+var CmdRestoreRepository = &cli.Command{
 	Name:        "restore-repo",
 	Usage:       "Restore the repository from disk",
 	Description: "This is a command for restoring the repository data.",
 	Action:      runRestoreRepository,
 	Flags: []cli.Flag{
-		cli.StringFlag{
-			Name:  "repo_dir, r",
-			Value: "./data",
-			Usage: "Repository dir path to restore from",
+		&cli.StringFlag{
+			Name:    "repo_dir",
+			Aliases: []string{"r"},
+			Value:   "./data",
+			Usage:   "Repository dir path to restore from",
 		},
-		cli.StringFlag{
+		&cli.StringFlag{
 			Name:  "owner_name",
 			Value: "",
 			Usage: "Restore destination owner name",
 		},
-		cli.StringFlag{
+		&cli.StringFlag{
 			Name:  "repo_name",
 			Value: "",
 			Usage: "Restore destination repository name",
 		},
-		cli.StringFlag{
+		&cli.StringFlag{
 			Name:  "units",
 			Value: "",
 			Usage: `Which items will be restored, one or more units should be separated as comma.
 wiki, issues, labels, releases, release_assets, milestones, pull_requests, comments are allowed. Empty means all units.`,
 		},
-		cli.BoolFlag{
+		&cli.BoolFlag{
 			Name:  "validation",
 			Usage: "Sanity check the content of the files before trying to load them",
 		},