NOTE: Breaked out from T248193.
The Growth team feature set contains features that require experienced users to participate: mentorship module. As we scale Growth features to 100 wikis, we know that we will encounter wikis who do not have active mentors. Some of those wikis will need time to develop a list of active mentors, and some wikis will never manage to develop it.
We want to be able to deploy, to a given wiki, all the Growth features that do //not// require mentors to be available, and be able to separately deploy the remaining features when ready. That means we want to have a way to deploy our features without the mentorship module of the homepage. Without this capability, the homepage should only contain all the other modules.
Perhaps a good thing to think about (in relation to T246939), is whether wikis could turn on those remaining features just by slotting a help desk page or a mentor list page into an on-wiki config, so that the Growth team doesn't have to actively deploy the remaining features later.
==== New state
Once the patch for this gets deployed, it will be possible to disable mentorship module via a configuration change (currently managed in server configuration repository; in the future, on-wiki). This will affect both the newcomer homepage (no mentorship module shown) and the help panel (it will always point to the help desk, no matter what the wiki configuration is like).
This will //not// make help panel working without any help desk (in scope for T273118), and it will not make help desk working when there are no mentors, but mentorship is enabled (in scope for T273782).