fix(try-it-out): required boolean default value set to empty string (#6449)

ref: #6429

* fix(try-it-out): required boolean default value set to empty string
* test(try-it-out): required enum and boolean fields

test/e2e-cypress/static/documents/features/schema-form-enum-boolean.yaml

@@ -0,0 +1,87 @@
+swagger: "2.0"
+info:
+  description: "Test Required Enum and Boolean with Execute" 
+  version: "1.0.0"
+  title: "Swagger Petstore"
+  termsOfService: "http://swagger.io/terms/"
+  contact:
+    email: "apiteam@swagger.io"
+  license:
+    name: "Apache 2.0"
+    url: "http://www.apache.org/licenses/LICENSE-2.0.html"
+host: "petstore.swagger.io"
+basePath: "/v2"
+tags:
+- name: "pet"
+  description: "Everything about your Pets"
+  externalDocs:
+    description: "Find out more"
+    url: "http://swagger.io"
+schemes:
+- "https"
+- "http"
+paths:
+  /pet/findByStatus:
+    get:
+      tags:
+      - "pet"
+      summary: "Finds Pets by status"
+      description: "Multiple status values can be provided with comma separated strings"
+      operationId: "findPetsByStatus"
+      produces:
+      - "application/xml"
+      - "application/json"
+      parameters:
+      - name: "status"
+        in: "query"
+        description: "Status values that need to be considered for filter"
+        required: true
+        type: "array"
+        items:
+          type: "string"
+          enum:
+          - "available"
+          - "pending"
+          - "sold"
+          default: "available"
+        collectionFormat: "multi"
+      - name: "expectIsOptional"
+        in: "query"
+        description: "this field should be optional"
+        required: false
+        type: boolean
+      - name: "expectIsRequired"
+        in: "query"
+        description: "this field should be required"
+        required: true
+        type: boolean
+      responses:
+        "200":
+          description: "successful operation"
+          schema:
+            type: "array"
+            items:
+              $ref: "#/definitions/Pet"
+        "400":
+          description: "Invalid status value"
+definitions:
+  Pet:
+    type: "object"
+    required:
+    - "name"
+    properties:
+      id:
+        type: "integer"
+        format: "int64"
+      name:
+        type: "string"
+        example: "doggie"
+      status:
+        type: "string"
+        description: "pet status in the store"
+        enum:
+        - "available"
+        - "pending"
+        - "sold"
+    xml:
+      name: "Pet"