Add a test for complex variable resolution with 3 levels (#2163)

Follow up to #2157. That PR repeated variable resolution. This test
still does not resolve fully but would resolve with 3 passes. This is
slightly different from complex-transitive-deeper - this test does not
show any errors, the issue is purely not enough passes.

acceptance/bundle/variables/complex-transitive-deep/databricks.yml

@@ -0,0 +1,21 @@
+bundle:
+  name: complex-transitive
+
+variables:
+  catalog:
+    default: hive_metastore
+  spark_conf_1:
+    default:
+      "spark.databricks.sql.initial.catalog.name": ${var.catalog}
+  spark_conf:
+    default: ${var.spark_conf_1}
+  etl_cluster_config:
+    type: complex
+    default:
+      spark_version: 14.3.x-scala2.12
+      runtime_engine: PHOTON
+      spark_conf: ${var.spark_conf}
+
+resources:
+  clusters:
+    my_cluster: ${var.etl_cluster_config}

acceptance/bundle/variables/complex-transitive-deep/output.txt

@@ -0,0 +1,3 @@
+{
+  "spark.databricks.sql.initial.catalog.name": "${var.catalog}"
+}

acceptance/bundle/variables/complex-transitive-deep/script

@@ -0,0 +1,2 @@
+# Currently, this incorrectly outputs variable reference instead of resolved value
+$CLI bundle validate -o json | jq '.resources.clusters.my_cluster.spark_conf'