Add upgrade warning when using legacy phinxlog tables (#1016)

Show a warning in the status command output when the migration
table is a legacy phinxlog table, directing users to run
`migrations upgrade` to switch to the unified cake_migrations table.

Author: dereuromark

src/Command/StatusCommand.php

@@ -18,6 +18,7 @@
 use Cake\Console\ConsoleIo;
 use Cake\Console\ConsoleOptionParser;
 use Migrations\Config\ConfigInterface;
+use Migrations\Db\Adapter\UnifiedMigrationsTableStorage;
 use Migrations\Migration\ManagerFactory;
 
 /**
@@ -153,6 +154,9 @@ public function execute(Arguments $args, ConsoleIo $io): ?int
     protected function display(array $migrations, ConsoleIo $io, string $tableName): void
     {
         $io->out(sprintf('using migration table <info>%s</info>', $tableName));
+        if ($tableName !== UnifiedMigrationsTableStorage::TABLE_NAME) {
+            $io->warning('You are using legacy phinxlog tables. Run `migrations upgrade` to switch to the unified `cake_migrations` table.');
+        }
         $io->out('');
 
         if ($migrations) {