Changes to Create billing project

the endpoint scheme security developerAuth was removed from the API

added the new path request parameter billing_project

removed the request body

the response's body type changed from object to string for status 200

deleted the header request parameter x-hail-return-jinja-context

api operation id createBillingProjectUI removed and replaced with

the endpoint scheme security developerAuth was added to the API

api tag Billing added

api tag Billing Projects removed

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 409

the response's body type changed from string to object for status 200

deleted the path request parameter billing_project

api operation id createBillingProjectUI was added

api tag Billing Projects added

api tag Billing removed

added the new optional header request parameter x-hail-return-jinja-context

added optional request body

removed the non-success response with the status 401

removed the non-success response with the status 403

removed the non-success response with the status 409