ci_fairy: Include commit SHA in junit error

It is already included in the testsuite name, but that isn't shown
in gitlab's UI, with the result that the front-page error report
is often useless and the user has to check out the pipeline logs.

Signed-off-by: Florian Müllner <fmuellner@gnome.org>
14 jobs for master in 10 minutes and 9 seconds (queued for 3 seconds)
Child pipeline (parent)
Status Job ID Name Coverage
  Fedora Container Build
passed #7645238
fedora:32@container-build@x86_64

00:02:12

passed #7645227
aarch64
fedora:33@container-build@aarch64

00:02:07

passed #7645216
fedora:33@container-build@x86_64

00:01:46

passed #7645233
kvm
fedora:33@qemu-build@x86_64

00:08:17

passed #7645220
fedora@cache-container-build@x86_64

00:01:51

 
  Fedora Check
passed #7645266
check labels fedora@x86_64:33

00:00:19

passed #7645263
do not rebuild fedora:33@container-build@x86_64

00:00:23

passed #7645272
fedora:32@check@x86_64

00:00:13

passed #7645248
fedora:33@base-image@x86_64

00:01:25

passed #7645257
aarch64
fedora:33@check@aarch64

00:00:34

passed #7645244
fedora:33@check@x86_64

00:00:16

passed #7645260
kvm
fedora:33@qemu-check@x86_64

00:01:51

passed #7645254
fedora@cache-check@x86_64

00:00:09

passed #7645269
pull upstream fedora:33@container-build@x86_64

00:00:21