fix(schema): propagate strictQuery to implicitly created schemas for embedded discriminators

[vkarpov15]

Fix #12796

Summary

The root cause of #12796 is that we don't propagate strictQuery to implicitly created schemas like we do strict. So if global strictQuery is false, but the implicitly created schema's strictQuery is true. That gets even more confusing because embedded discriminator schemas do pick up the global strictQuery default, so with global strictQuery = false you get an error every time you create an embedded discriminator.

Examples

[hasezoey]

LGTM