Enhance helm missing output when calling cnf-testsuite setup

Describe the bug

./cnf-setup shouldn't print the missing dependencies in a full crystal backtrace. See kubectl missing as a good output

./cnf-testsuite setup
CNF TestSuite version: main-2026-05-12-121232-080bef98
Successfully created directories for cnf-testsuite
src/modules/helm/utils.cr:90:18 in 'get'
src/tasks/setup/helmenv_setup.cr:10:9 in '->'
lib/sam/src/sam/task.cr:54:39 in 'call'
lib/sam/src/sam/execution.cr:20:7 in 'invoke'
lib/sam/src/sam/task.cr:44:29 in 'call'
lib/sam/src/sam/execution.cr:20:7 in 'invoke'
lib/sam/src/sam.cr:35:5 in 'invoke'
lib/sam/src/sam.cr:53:7 in 'process_tasks'
src/cnf-testsuite.cr:122:3 in '__crystal_main'
/usr/lib/crystal/lib/crystal/main.cr:118:5 in 'main_user_code'
/usr/lib/crystal/lib/crystal/main.cr:104:7 in 'main'
/usr/lib/crystal/lib/crystal/main.cr:130:3 in 'main'
/lib/x86_64-linux-gnu/libc.so.6 in '??'
/lib/x86_64-linux-gnu/libc.so.6 in '__libc_start_main'
./cnf-testsuite in '_start'
???
No Helm binary found locally or globally.

./cnf-testsuite setup
CNF TestSuite version: main-2026-05-12-121232-080bef98
Successfully created directories for cnf-testsuite
No Global kubectl version found
No Local kubectl version found
Kubectl not found

    Linux installation instructions for Kubectl can be found here: https://kubernetes.io/docs/tasks/tools/install-kubectl/

    Install kubectl binary with curl on Linux
    Download the latest release with the command:

    curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
    To download a specific version, replace the $(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt) portion of the command with the specific version.

      For example, to download version v1.18.0 on Linux, type:

      curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.18.0/bin/linux/amd64/kubectl
    Make the kubectl binary executable.

      chmod +x ./kubectl
    Move the binary in to your PATH.

      sudo mv ./kubectl /usr/local/bin/kubectl
    Test to ensure the version you installed is up-to-date:

      kubectl version --client
    
Global helm found. Version: 4.1.4
Local helm not found
Global git found. Version: 2.47.3
No Local git version found
Dependency installation failed. Some prerequisites are missing. Please install all of the prerequisites before continuing.