Updating a contact does not work

[andyneil]

If you use the HubspotWorkflow workflow more than once with the same details, it will fail.
After checking the source, this looks to be because the response returned from HS is HTTP 409 - Conflict.
Should the functionality be extended to:

• First check if the contact exists in HS, if so get the contactId
  -- If so, make a subsequent PATCH call, to /crm/v3/objects/contacts/{contactId} as detailed in the API docs
  -- If not, continue the create as currently works.

[AndyButland]

We've applied an update to do an update if the contact already exists according to HubSpot via a provision of a 409 response.