feat: convert entire CLI to clibase (#6491)

I'm sorry.

cmd/coder/main.go

@@ -1,27 +1,12 @@
 package main
 
 import (
-	"errors"
-	"fmt"
-	"math/rand"
-	"os"
-	"time"
 	_ "time/tzdata"
 
 	"github.com/coder/coder/cli"
-	"github.com/coder/coder/cli/cliui"
 )
 
 func main() {
-	rand.Seed(time.Now().UnixMicro())
-
-	cmd, err := cli.Root(cli.AGPL()).ExecuteC()
-	if err != nil {
-		if errors.Is(err, cliui.Canceled) {
-			os.Exit(1)
-		}
-		cobraErr := cli.FormatCobraError(err, cmd)
-		_, _ = fmt.Fprintln(os.Stderr, cobraErr)
-		os.Exit(1)
-	}
+	var rootCmd cli.RootCmd
+	rootCmd.RunMain(rootCmd.AGPL())
 }