TypeError: array_filter(): Argument #1 ($array) must be of type array, Drupal\webform\Plugin\WebformHandlerPluginCollection given [#3536036]

Problem/Motivation

The change that was done in commit #b99c0cf was completely untested. $webform->getHandlers() never returns an array, but an instance of WebformHandlerPluginCollection. This causes Mollie callbacks to fail. The following error is thrown:

TypeError: array_filter(): Argument #1 ($array) must be of type array, Drupal\webform\Plugin\WebformHandlerPluginCollection given in array_filter() (regel 43 van /[..]/web/modules/contrib/cmrf_form_processor/modules/cmrf_form_processor_mollie/src/EventSubscriber/MollieFormProcessorSubscriber.php).

Issue fork cmrf_form_processor-3536036

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3536036-must-be-type-array changes, plain diff MR !41
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