Many: replace 'which' with 'type -p' in test cases

Unfortunately, `which` does not seem to be installed by default on our
F41 CI images. Instead of doing the dance with rebuilds, which has been
problematic recently, let's not rely on `which` in scripts any more,
since we can replace it with the Bash built-in `type` command.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

test/cases/aws.sh

@@ -20,9 +20,9 @@ CONTAINER_IMAGE_CLOUD_TOOLS="quay.io/osbuild/cloud-tools:latest"
 /usr/libexec/osbuild-composer-test/provision.sh none
 
 # Check available container runtime
-if which podman 2>/dev/null >&2; then
+if type -p podman 2>/dev/null >&2; then
     CONTAINER_RUNTIME=podman
-elif which docker 2>/dev/null >&2; then
+elif type -p docker 2>/dev/null >&2; then
     CONTAINER_RUNTIME=docker
 else
     echo No container runtime found, install podman or docker.