Enable ORGANIZATIONS_APP for devstack Studio (#24820)

It is already enabled in devstack LMS, stage LMS/Studio,
and prod LMS/Studio.

However, it is currently disabled in edge LMS/Studio,
and as far as I know, sandbox LMS/Studio as well as the
default Open edX LMS/Studio.

We would like to move towards enabling it globally by
default, and enabling it in devstack Studio would be
a first step towards that.