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.sh

@@ -3,6 +3,7 @@ set -euo pipefail
 
 # Get OS data.
 source /usr/libexec/osbuild-composer-test/set-env-variables.sh
+source /usr/libexec/tests/osbuild-composer/shared_lib.sh
 
 # Get compose url if it's running on unsubscried RHEL
 if [[ ${ID} == "rhel" ]] && ! sudo subscription-manager status; then
@@ -115,15 +116,6 @@ function greenprint {
     echo -e "\033[1;32m[$(date -Isecond)] ${1}\033[0m"
 }
 
-function get_build_info() {
-    key="$1"
-    fname="$2"
-    if rpm -q --quiet weldr-client; then
-        key=".body${key}"
-    fi
-    jq -r "${key}" "${fname}"
-}
-
 # Start libvirtd and test it.
 greenprint "🚀 Starting libvirt daemon"
 sudo systemctl start libvirtd