Those were added in:

    commit 146c6a95
    Author: Thibault Saunier <tsaunier@gnome.org>
    Date:   Wed Oct 14 11:56:23 2015 +0100

        default testsuite: Add prores tests

validate:

    commit 3bd31854a8c569068bbd75160d724fd6ce39d265
    Author: Sebastian Dröge <sebastian@centricular.com>
    Date:   Tue Oct 27 15:51:44 2015 +0200

        validate: Un-blacklist seeking HLS tests

        They are reliable enough after
        36b80edb7263118467dfcaee3923f7c964ae6bc8 in gst-plugins-base now.