Enhancement: Include account/workspace urls in workpool creation wizard

[znicholasbrown]

When setting up a work pool, users are asked for an account/workspace-embedded URL for their workers to use. Right now this is a URL the users have to infer from the page URL and their various IDs... this doesn't feel nice 😞

We should construct that URL for users and display it in a copyable place in work pool screens (both form and view)

cc @desertaxle @zhen0