Support $$HOST wildcard in calculated data expressions

[#1]

Description: Add support for the wildcard $$HOST in calculated data expressions

Why is this feature important to you:

It would allow us to define a calculated data expression that outputs a Workfront URL for the current environment (i.e. Prod / Preview / SB01 / SB02).

How would you like the feature to work:

The wildcard $$HOST would render the base URL of the current workfront environment.

• For Workfront instances on IMS, it would render https://experience.adobe.com/#/@<IMS>/so:<environment>/workfront
• For Workfront instances not on IMS, it would render https://<instance>.<environment>.workfront.com

For example, the calculated expression "$$HOST/requests/submitted" would render a link to the requests section in the current Workfront environment.

Likewise, CONCAT($$HOST,"/user/",{DE:MY-USER-TYPEAHED-FIELD:ID}) would render a link to the user selected in a typeahead field on the form.

In both examples, the link would automatically reflect the environment, so we wouldn't need to mantain the formulas in each environment separately (and fix them in SB01/02 after each data refresh).

Current Behaviour: $$HOST wildcard is not supported in the calculated data expressions.