When this code was moved from being in zerver in 21a2fd482e, it kept
the `if ZILENCER_ENABLED` blocks. Since ZILENCER and CORPORATE are
generally either both on or both off, the if statement became
mostly-unnecessary.
However, because tests cannot easily remove elements from
INSTALLED_APPS and re-determine URL resolution, we switch to checking
`if CORPORATE_ENABLED` as a guard, and leave these in-place.
The other side effect of this is that with e54ded49c4, most Zulip
deployments started to 404 requests for `/apps` instead of redirecting
them to `https://zulip.com/apps/` since they no longer had any path
configured for `/apps`. Unfortunately, this URL is in widespread use
in the app (e.g. in links from the Welcome Bot), so we should ensure
that it does successfully redirect.
Add the `/apps` path to `zerver`, but only if not CORPORATE_ENABLED,
so the URLs do not overlap.
Updates the organizations listed in the open communities directory
to also include organizations that do not require an invite and do
not restrict email domains for new users to join the organization.
Anders Kaseorg
Tim Abbott
Alex Vandiver
Lauryn Menard
Aman Agrawal