[Ubuntu] Get toolset value function. (#2435)

* [macOS] Fail Pester tests on error

* return it back

* [Ubuntu] add get_toolset_values function

* added fix

* fix all nitpicks

* try to get rid brackets

* removed brackets.

* pipx-package fix

images/linux/scripts/helpers/install.sh

@@ -47,4 +47,14 @@ function IsPackageInstalled {
 verlte() {
     sortedVersion=$(echo -e "$1\n$2" | sort -V | head -n1)
     [  "$1" = "$sortedVersion" ]
+}
+
+get_toolset_path() {
+    echo "/imagegeneration/installers/toolset.json"
+}
+
+get_toolset_value() {
+    local toolset_path=$(get_toolset_path)
+    local query=$1
+    echo "$(jq -r "$query" $toolset_path)"
 }