Support validation on new entity/validation not performed on new entities

Entity validation was recently touched in 🐛 State transition validation should only happen after a transition is applied. Fixed as well, though indirectly through the state item's ::isValid() method. I _think_ the changes there make this change possible.

I'm guessing the isNew() check is there to allow setting any state for new entities?

Test failure is due to #3358048-18: Do not use persist tag for keyvalue.memory in KernelTestBase → - see https://drupal.slack.com/archives/C51GNJG91/p1683734282969649

I'm guessing the isNew() check is there to allow setting any state for new entities?

That dates back to the initial implementation of this validator and I think it probably just didn't work at the time on new entities? Your latest changes to the validator seem to make this possible. Let's check the test results. I'll run it on 10.x instead since 9.5.x testing is temporarily broken.

Doesn't break existing suite on D9 or D10, I think this just needs tests.

This exact change was made in 🐛 State constraint is not validated on new entities Fixed . Closing this as a duplicate.