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>
8 jobs for master in 2 minutes and 20 seconds (queued for 6 seconds)
Child pipeline (parent)
Status Job ID Name Coverage
  Arch Container Build
passed #7645207
arch@cache-container-build@x86_64

00:01:08

passed #7645205
arch:rolling@container-build@x86_64

00:01:05

 
  Arch Check
passed #7645222
arch@cache-check@x86_64

00:00:10

passed #7645218
arch:rolling@base-image@x86_64

00:01:13

passed #7645213
arch:rolling@check@x86_64

00:00:24

passed #7645231
check labels arch@x86_64:rolling

00:00:20

passed #7645225
do not rebuild arch:rolling@container-build@x86_64

00:00:20

passed #7645237
pull upstream arch:rolling@container-build@x86_64

00:00:37