When updating alias of parent node also update aliases of child nodes [#3362727]

Problem/Motivation

When a node that is pointed to as a parent from other nodes gets saved, it updates its own alias. It would be really convenient if all the other nodes pointing to it would also update their aliases.

Proposed resolution

When saving one node, check if any other node points to it as a parent, then save those nodes too.

Issue fork pathauto_entity_parent-3362727

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3362727-issue-patch changes, plain diff MR !1
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