control-service: install kubectl (#2290)

# Why
The script deploy-testing-pipelines-service.sh needs kubectl installed
if you are setting up the env.
Here I install it so we can use the setup env in this step.

I discovered this because I am trying to create secrets in a new
namespace in this PR
#2269.


This must be a regression from when we moved away from the aws image.

---------

Signed-off-by: murphp15 <[email protected]>

projects/control-service/cicd/.gitlab-ci.yml

@@ -257,6 +257,9 @@ control_service_deploy_testing_data_pipelines:
     - pip install --upgrade pip && pip install awscli
     - export FRONTEND_TAG=latest
     - export DESIRED_VERSION=v3.12.0 # helm version
+    - curl -LO https://dl.k8s.io/release/v1.27.2/bin/linux/amd64/kubectl
+    - chmod +x ./kubectl
+    - mv ./kubectl /usr/bin/kubectl
     - curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
     - bash -ex ./projects/control-service/cicd/deploy-testing-pipelines-service.sh
   retry: !reference [.control_service_retry, retry_options]