Support for ECA 3 [#3532252]

Problem/Motivation

The method \Drupal\group_action\Plugin\Action\GroupActionBase::isBpmnIoModeller checks for a route parameter which is no longer a scalar ECA ID but an ECA entity. That causes some warnings, that should be avoided.

Issue fork group_action-3532252

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3532252-support-for-eca changes, plain diff MR !3
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