Turn error initializing Core Data into proper exception

[koke]

This would at least allow us to capture the message and context of the error

For #12338

I'm wondering if we should ship this in a 13.2 hot fix instead, since 13.3 is still a week away (cc @jtreanor)

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[aerych]

Makes sense to me.