chore(deps-dev): update cypress to v12 (#8889)

This update required changing the configuration
and test directory structure. Some tests needed
to be amended as well to compensate for new
Cypress APIs.

test/e2e-cypress/e2e/bugs/5455.cy.js

@@ -0,0 +1,11 @@
+// http://github.com/swagger-api/swagger-ui/issues/5455
+
+describe("#5455: Request bodies w/o `examples` should not render a dropdown", () => {
+  it("should not render a <select> element", () => {
+    cy.visit("/?url=/documents/bugs/5455.yaml")
+      .get("#operations-default-post_foo")
+      .click()
+      .get(".opblock-section-request-body > .opblock-description-wrapper")
+      .should("not.have.descendants", "select")
+  })
+})