This patch updates the guidelines location. The guidelines will be
moved there by [1]. In order to shorten the transition period we
are intentionally doing this *before* [1] is merged (before the
guidelines are actually moved) because it takes some time to get
this change to production. Due to that the patch also implement
a fail-safe mechanism - if the get request for guidelines returns
404, the code will try again with the old (at this moment the
current) location.
When this gets to production, we will merge [1]. Then the
fail-safe mechanism will no longer be needed, therefore it will be
removed in a follow up patch.
[1] https://review.opendev.org/c/osf/interop/+/786116
Change-Id: I5d81d0168601f2b6c3b5cae996b531ebdb33d9d0
81928c2e10