Invalid OpenAPI file generated when path parameters are included.

[fortyCakes]

Describe the issue
When I include path parameters, the file generated does not meet OpenApi spec because the "required: true" is omitted. It looks like the "Required" is being ignored entirely for this parameter, as it also doesn't have a required annotation in the Swagger UI.

To Reproduce
Steps to reproduce the behavior:

 [OpenApiOperation(
     operationId: "ListUnread",
     tags: new[] { "notification" },
     Summary = "Lists unread notifications",
     Description = "Lists all unread notifications assigned to the calling user."
     )]
 [OpenApiParameter("tenantId", Description = "The tenant ID of the current customer.", Type = typeof(Guid), Required = true, In = ParameterLocation.Path)]
 [OpenApiResponseWithBody(statusCode: HttpStatusCode.OK, contentType: "application/json", bodyType: typeof(IEnumerable<NotificationTableEntity>), Summary = "Unread notifications", Description = "This returns a list of notifications.")]
 [Function("ListUnread")]
 public IActionResult ListUnread(
     [HttpTrigger(AuthorizationLevel.User, "get", Route = "{tenantId:guid}/notification/unread")] HttpRequest req, Guid tenantId,
     ILogger log)
 {

Generate a v3.yaml (or any other output) file:

paths:
  '/{tenantId}/notification/unread':
    get:
      tags:
        - notification
      summary: Lists unread notifications
      description: Lists all unread notifications assigned to the calling user.
      operationId: ListUnread
      parameters:
        - name: tenantId
          in: path
          description: The tenant ID of the current customer.
          schema:
            type: string
            format: uuid
      responses:
        '200':
          description: This returns a list of notifications.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/notificationTableEntity'
          x-ms-summary: Unread notifications

Expected behavior
The "parameters" section should have "required: true" under the parameter.

Environment (please complete the following information, if applicable):

• OS: happens on local Windows build and building on ubuntu-latest
• Version v1.5.1, v2.0.0-preview2