fix: no-required-schema-properties rule to report when required properties are not defined in all branches (#2705)

chore: refactor the no-required-schema-properties rule

Author: tatomyr

.changeset/fine-cows-begin.md

@@ -0,0 +1,6 @@
+---
+"@redocly/openapi-core": patch
+"@redocly/cli": patch
+---
+
+Fixed the `no-required-schema-properties-undefined` rule to report when a required property is not defined in every `oneOf`/`anyOf` branch.