Exclude unsupported EFO branches from Open Targets term mapping

[apriltuesday]

Open Targets uses the slim version of EFO, which excludes some branches such as material entity. We should ensure the automation fetches terms only from this subset when we are running Open Targets processing.

[apriltuesday]

One way to do this is to just use the regex OT uses during validation to filter the terms we fetch, but this doesn't help us catch potential issues with that regex.