feat: add app name verification to all golang plugins

Moving verification of input to the earliest place is the best way to decrease the need to validate this further downstream.

Additionally, some of the existing checks were.... lacking :)

plugins/logs/subcommands.go

@@ -1,7 +1,6 @@
 package logs
 
 import (
-	"errors"
 	"fmt"
 	"strconv"
 
@@ -10,10 +9,6 @@ import (
 
 // CommandDefault displays recent log output
 func CommandDefault(appName string, num int64, process string, tail, quiet bool) error {
-	if appName == "" {
-		return errors.New("Please specify an app to run the command on")
-	}
-
 	if err := common.VerifyAppName(appName); err != nil {
 		return err
 	}