Refactor: libpe_status: Drop support for per-resource failcounts

This was needed for rolling upgrade compatibility with nodes <= 1.1.17.
We no longer support rolling upgrades for < 2.0.0.

This breaks several scheduler regression tests that use as input old
CIBs with per-resource failcounts. For ease of review, we'll fix that in
a separate commit.

Ref T13

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>