[#23314] YSQL: Fix variable name to yb_ for ATPrepSetTableSpace

Summary:
Renamed the cascade variable to yb_cascade in ATPrepSetTableSpace, as it is a YugabyteDB-specific parameter introduced in commit 06baaf0 / D37055.

Jira: DB-12239

Test Plan: ./yb_build.sh --java-test org.yb.pgsql.TestPgRegressColocatedTablesWithTablespaces#testPgRegressColocatedTablesWithTablespaces

Reviewers: jason

Reviewed By: jason

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D38170

src/postgres/src/backend/commands/tablecmds.c

@@ -490,7 +490,8 @@ static ObjectAddress ATExecClusterOn(Relation rel, const char *indexName,
 static void ATExecDropCluster(Relation rel, LOCKMODE lockmode);
 static bool ATPrepChangePersistence(Relation rel, bool toLogged);
 static void ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
-					const char *tablespacename, LOCKMODE lockmode, bool cascade);
+								const char *tablespacename, LOCKMODE lockmode,
+								bool yb_cascade);
 static void ATExecSetTableSpace(Oid tableOid, Oid newTableSpace, LOCKMODE lockmode);
 static void ATExecSetTableSpaceNoStorage(Relation rel, Oid newTableSpace);
 static void ATExecSetRelOptions(Relation rel, List *defList,
@@ -12125,7 +12126,8 @@ ATExecDropCluster(Relation rel, LOCKMODE lockmode)
  */
 static void
 ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
-					const char *tablespacename, LOCKMODE lockmode, bool cascade)
+					const char *tablespacename, LOCKMODE lockmode,
+					bool yb_cascade)
 {
 	Oid			tablespaceId;
 
@@ -12153,7 +12155,7 @@ ATPrepSetTableSpace(AlteredTableInfo *tab, Relation rel,
 				 errmsg("cannot set tablespace for primary key index")));
 	}
 
-	if (IsYugaByteEnabled() && !cascade && MyDatabaseColocated &&
+	if (IsYugaByteEnabled() && !yb_cascade && MyDatabaseColocated &&
 		YbGetTableProperties(rel)->is_colocated)
 	{
 		/*