test: new weldr client compatibility for test scripts

- Handle the array responses from the new weldr-client (>= 35.6).
- Move the `get_build_info` function to shared_libs.sh to source and
  reuse in multiple places.

test/cases/ostree-raw-image.sh

@@ -4,6 +4,8 @@ set -euo pipefail
 # Provision the software under test.
 /usr/libexec/osbuild-composer-test/provision.sh none
 
+source /usr/libexec/tests/osbuild-composer/shared_lib.sh
+
 # Get OS data.
 source /etc/os-release
 ARCH=$(uname -m)
@@ -13,15 +15,6 @@ function greenprint {
     echo -e "\033[1;32m[$(date -Isecond)] ${1}\033[0m"
 }
 
-function get_build_info() {
-    key="$1"
-    fname="$2"
-    if rpm -q --quiet weldr-client; then
-        key=".[0].body${key}"
-    fi
-    jq -r "${key}" "${fname}"
-}
-
 # Start libvirtd and test it.
 greenprint "🚀 Starting libvirt daemon"
 sudo systemctl start libvirtd