Refactor for new external stack directory layout under common parent (#815)

Reviewed-on: cerc-io/stack-orchestrator#815
Co-authored-by: David Boreham <david@bozemanpass.com>
Co-committed-by: David Boreham <david@bozemanpass.com>

.gitea/workflows/triggers/test-external-stack

@@ -1 +1,2 @@
 Change this file to trigger running the external-stack CI job
+trigger

tests/external-stack/run-test.sh

@@ -31,7 +31,7 @@ rm -rf $CERC_REPO_BASE_DIR
 mkdir -p $CERC_REPO_BASE_DIR
 # Clone the external test stack
 $TEST_TARGET_SO fetch-stack git.vdb.to/cerc-io/test-external-stack
-stack_name="$CERC_REPO_BASE_DIR/test-external-stack/stacks/test-external-stack"
+stack_name="$CERC_REPO_BASE_DIR/test-external-stack/stack-orchestrator/stacks/test-external-stack"
 TEST_TARGET_SO_STACK="$TEST_TARGET_SO --stack ${stack_name}"
 # Test bringing the test container up and down
 # with and without volume removal