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/gcp.sh

@@ -8,6 +8,7 @@
 #
 
 source /usr/libexec/osbuild-composer-test/set-env-variables.sh
+source /usr/libexec/tests/osbuild-composer/shared_lib.sh
 
 set -euo pipefail
 
@@ -16,15 +17,6 @@ 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}"
-}
-
 # Container image used for cloud provider CLI tools
 CONTAINER_IMAGE_CLOUD_TOOLS="quay.io/osbuild/cloud-tools:latest"
 
@@ -206,14 +198,6 @@ get_compose_metadata () {
     sudo cat "${COMPOSE_ID}".json | jq -M '.' | tee "$METADATA_FILE" > /dev/null
 }
 
-is_weldr_client_installed () {
-    if rpm --quiet -q weldr-client; then
-        echo true
-    else
-        echo false
-    fi
-}
-
 # Write an GCP TOML file
 tee "$GCP_CONFIG" > /dev/null << EOF
 provider = "gcp"