Do we need to pass `resource_url_template` into workspaces?

Description

In the Web IDE Engineering Sync, we were enlightened to the possibility that workspaces does not require the resource_url_template part of the extension marketplace settings. This is because VSCode only needs this in the web (non-server backed) environment in order to pull specific files down.

Acceptance Criteria

• Do we need this or not? If not, remove it!