Allow tokens on Saleforce URL and OID

Problem/Motivation

I would like to have configuration pages where my client will be able to set the Organization Id and Salesforce URL instead of granting access to them to update the webform handlers.

Proposed resolution

• Update the SalesforceWebToLeadPostWebformHandler
• Update the SalesforceWebToLeadPostWebformHandler::buildConfigurationForm from url to textfield
• Update the SalesforceWebToLeadPostWebformHandler::remotePost to call tokenManager replace
• Update the SalesforceWebToLeadPostWebformHandler::getRequestData to call tokenManager replace