fix: required properties (#7206)

* fix: required properties

schema required properties should not be treated like required: true.
this lead to objects that requires properties being treated as required itself

* test: try-it-out-schema-required-override-allowed

Co-authored-by: Tim Lai <timothy.lai@gmail.com>

test/e2e-cypress/tests/features/try-it-out-schema-required-override-allowed.js

@@ -0,0 +1,15 @@
+describe("Try It Out: schema required properties can be overriden", () => {
+  it("should execute", () => {
+    cy
+      .visit("?tryItOutEnabled=true&url=/documents/features/try-it-out-schema-required-override-allowed.yaml")
+      .get("#operations-default-setDeliveryLocation")
+      .click()
+      .get(".body-param__text")
+      .should("include.value", "testProperty")
+      .clear() // swagger-ui will auto insert "{}" into textarea
+      .get(".execute-wrapper > .btn")
+      .click()
+      .get(".curl-command")
+      .should("exist")
+  })
+})