automation: add missing "needs"

The test artifacts export jobs don't need prerequisites, so we should
specify "needs" with an empty array for them. That way, they are not
going to fruitlessly wait for previous jobs (ECLAIR jobs) to complete
before continuing.

Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>

automation/gitlab-ci/build.yaml

@@ -268,6 +268,7 @@
 
 .test-jobs-artifact-common:
   stage: build
+  needs: []
   except: !reference [.test-jobs-common, except]
 
 # Arm test artifacts