fix(discriminator): make base schema paths come before discriminator schema paths when running setters, validators, etc. #13846
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Fix #13794
Summary
Right now, discriminators add base schema paths to the child schema, which means that setters and validators on child schema paths run before setters and validators on base schema paths. This PR switches that order.
While this PR doesn't break any of our tests, I'm considering merging it into 8.0 branch just in case. Any thoughts @hasezoey @AbdelrahmanHafez ?
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