[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/installers/clang.sh

@@ -6,6 +6,7 @@
 
 # Source the helpers for use with the script
 source $HELPER_SCRIPTS/os.sh
+source $HELPER_SCRIPTS/install.sh
 
 function InstallClang {
     local version=$1
@@ -32,10 +33,8 @@ function SetDefaultClang {
 wget https://apt.llvm.org/llvm.sh
 chmod +x llvm.sh
 
-toolset="$INSTALLER_SCRIPT_FOLDER/toolset.json"
-
-versions=$(jq -r '.clang.versions[]' $toolset)
-default_clang_version=$(jq -r '.clang.default_version' $toolset)
+versions=$(get_toolset_value '.clang.versions[]')
+default_clang_version=$(get_toolset_value '.clang.default_version')
 
 for version in ${versions[*]}; do
     InstallClang $version