Issue #3605961: Rename the Script task type to Pass-through

Frank Mablyrequested to merge
issue/orchestra-3605961:3605961-rename-the-script into 1.x

The kernel script task type runs no script: it is a no-op pass-through that advances immediately, so the name was misleading. This renames the plugin id to passthrough, the label to Pass-through and the class to PassThroughTask, and updates the description.

Also migrates the example workflow configs (node type plus the BPMN blob pluginid and the org.drupal.task.script element-template id) and the tests (including the two palette assertions).

Pre-1.0, no update hook: existing sites rewrite their stored workflow config by hand (node type plus the two blob occurrences).

Closes #3605961

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