Switch to entity owner in EntityContentBase during validation

Problem/Motivation

I opened 📌 Run drush imports as user=1 RTBC to solve part of the problem. But that solution is very much a sledgehammer solution when perhaps a more valid solution is to just switch the user if entity validation is enabled. This does the latter.

Proposed resolution

Switch to the entity owner if it implements EntityOwnerInterface

Test the latest patch by enabling validation on the destination entity i.e. validate: true.

source:
  plugin: d7_node
  node_type: page
process:
  title: title
  type: type
  body: body
destination:
  plugin: 'entity:node'
  validate: true

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet