CI: cleanup terraform + deduplicate and simplify

tests/scripts/create-tf.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-set -euxo pipefail
-
-cd ..
-terraform -chdir="contrib/terraform/$PROVIDER" apply -auto-approve -parallelism=1

tests/scripts/delete-tf.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-set -euxo pipefail
-
-cd ..
-terraform -chdir="contrib/terraform/$PROVIDER" destroy -auto-approve

tests/scripts/testcases_run.sh

@@ -16,8 +16,6 @@ fi
 export ANSIBLE_BECOME=true
 export ANSIBLE_BECOME_USER=root
 
-make -C tests create-${CI_PLATFORM} -s
-
 # Test collection build and install by installing our collection, emptying our repository, adding
 # cluster.yml, reset.yml, and remote-node.yml files that simply point to our collection's playbooks, and then
 # running the same tests as before