[SPARK-51522][SQL] Disable lazy union children test for single-pass Analyzer

### What changes were proposed in this pull request?

Disable lazy union children test for single-pass Analyzer.

### Why are the changes needed?

Single-pass Analyzer won't support this oddity - this is not possible to do using a regular Dataset API.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

`build/sbt "testOnly org.apache.spark.sql.execution.PlannerSuite"`

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #50289 from vladimirg-db/vladimir-golubev_data/disable-lazy-union-children-in-single-pass-analyzer.

Authored-by: Vladimir Golubev <vladimir.golubev@databricks.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>

Author: vladimirg-db

sql/core/src/test/scala/org/apache/spark/sql/execution/PlannerSuite.scala

@@ -744,18 +744,28 @@ class PlannerSuite extends SharedSparkSession with AdaptiveSparkPlanHelper {
   }
 
   test("SPARK-24500: create union with stream of children") {
-    @scala.annotation.nowarn("cat=deprecation")
-    val df = Union(Stream(
-      Range(1, 1, 1, 1),
-      Range(1, 2, 1, 1)))
-    df.queryExecution.executedPlan.execute()
+    withSQLConf(
+      SQLConf.ANALYZER_SINGLE_PASS_RESOLVER_ENABLED.key -> "false",
+      SQLConf.ANALYZER_DUAL_RUN_LEGACY_AND_SINGLE_PASS_RESOLVER.key -> "false"
+    ) {
+      @scala.annotation.nowarn("cat=deprecation")
+      val df = Union(Stream(
+        Range(1, 1, 1, 1),
+        Range(1, 2, 1, 1)))
+      df.queryExecution.executedPlan.execute()
+    }
   }
 
   test("SPARK-45685: create union with LazyList of children") {
-    val df = Union(LazyList(
-      Range(1, 1, 1, 1),
-      Range(1, 2, 1, 1)))
-    df.queryExecution.executedPlan.execute()
+    withSQLConf(
+      SQLConf.ANALYZER_SINGLE_PASS_RESOLVER_ENABLED.key -> "false",
+      SQLConf.ANALYZER_DUAL_RUN_LEGACY_AND_SINGLE_PASS_RESOLVER.key -> "false"
+    ) {
+      val df = Union(LazyList(
+        Range(1, 1, 1, 1),
+        Range(1, 2, 1, 1)))
+      df.queryExecution.executedPlan.execute()
+    }
   }
 
   test("SPARK-25278: physical nodes should be different instances for same logical nodes") {