Attempting to clean a seeder without a clean method causes a fatal error.

[g-elwell]

Describe the bug
Attempting to clean a seeder without a clean method causes a fatal error.

To Reproduce
Steps to reproduce the behavior:

1. Create a new Seeder class without a clean method
2. Run the seeder with the clean flag: npx wp-cypress seed MySeeder --clean-first
3. See the fatal error in your console

Expected behavior
Attempting to clean a seeder which does not have a clean method should produce an informative error.

This case is actually being handled already here:

wp-cypress/plugin/src/Seeder/SeedCommand.php

Line 121 in 9b32b48

WP_CLI::error( "clean() method does not exist on seeder {$seeder} class." );

The issue is that $seeder is a class instance. $seeder_name is available and using this here should fix the issue.

Error message

wp-cypress ✖ Fatal error: Uncaught Error: Object of class PostSeeder could not be converted to string in /var/www/html/wp-content/plugins/wp-cypress/src/Seeder/SeedCommand.php:121
Stack trace:
#0 /var/www/html/wp-content/plugins/wp-cypress/src/Seeder/SeedCommand.php(41): WP_Cypress\Seeder\SeedCommand->clean('PostSeeder')
#1 [internal function]: WP_Cypress\Seeder\SeedCommand->__invoke(Array, Array)
#2 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Dispatcher/CommandFactory.php(100): call_user_func(Array, Array, Array)
#3 [internal function]: WP_CLI\Dispatcher\CommandFactory::WP_CLI\Dispatcher\{closure}(Array, Array)
#4 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Dispatcher/Subcommand.php(497): call_user_func(Object(Closure), Array, Array)
#5 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(441): WP_CLI\Dispatcher\Subcommand->invoke(Array, Array, Array)
#6 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(464): WP_CLI\Runner->run_command(Array, Array)
#7 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1295): WP_CLI\Runner->run_command_and_exit()
#8 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/WP_CLI/Bootstrap/LaunchRunner.php(28): WP_CLI\Runner->start()
#9 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/bootstrap.php(83): WP_CLI\Bootstrap\LaunchRunner->process(Object(WP_CLI\Bootstrap\BootstrapState))
#10 phar:///usr/bin/wp/vendor/wp-cli/wp-cli/php/wp-cli.php(32): WP_CLI\bootstrap()
#11 phar:///usr/bin/wp/php/boot-phar.php(20): include('phar:///usr/bin...')
#12 /usr/bin/wp(4): include('phar:///usr/bin...')
#13 {main}
  thrown in /var/www/html/wp-content/plugins/wp-cypress/src/Seeder/SeedCommand.php on line 121
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