relax validation for internal schema fragments

...up/osdu/indexer/schema/converter/PropertiesProcessor.java

...ava/org/opengroup/osdu/indexer/schema/converter/readme.md

...st/resources/converter/tags/allOf/allOf-inside-allOf.json

...resources/converter/tags/allOf/allOf-inside-property.json

...rc/test/resources/converter/tags/allOf/indefinitions.json

...src/test/resources/converter/tags/mixAllAnyOneOf/mix.json

...rc/test/resources/converter/tags/oneOf/indefinitions.json

...re/src/test/resources/converter/wks/slb_wke_wellbore.json