[kotlin-spring, java-spring] - gate @JsonSetter on openApiNullable for optional non-nullable fields#23993

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Picazsoo:bugfix/add-@JsonSetter(nulls-=-Nulls.FAIL)-only-for-openApiNullablePicazsoo/openapi-generator:bugfix/add-@JsonSetter(nulls-=-Nulls.FAIL)-only-for-openApiNullableCopy head branch name to clipboard