[fix](Nereids) fix group concat (apache#33091)

Fix failed in regression_test/suites/query_p0/group_concat/test_group_concat.groovy

select
group_concat( distinct b1, '?'), group_concat( distinct b3, '?')
from
table_group_concat
group by
b2

exception:

lowestCostPlans with physicalProperties(GATHER) doesn't exist in root group

The root cause is '?' is push down to slot by NormalizeAggregate, AggregateStrategies treat the slot as a distinct parameter and generate a invalid PhysicalHashAggregate, and then reject by ChildOutputPropertyDeriver.

I fix this bug by avoid push down literal to slot in NormalizeAggregate, and forbidden generate stream aggregate node when group by slots is empty

(cherry picked from commit e7d6697)

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/NormalizeAggregate.java

@@ -182,11 +182,11 @@ private LogicalPlan normalizeAgg(LogicalAggregate<Plan> aggregate, LogicalHaving
                 );
 
         Set<Expression> needPushSelf = Sets.union(
-                categorizedNoDistinctAggsChildren.getOrDefault(true, new HashSet<>()),
-                categorizedDistinctAggsChildren.getOrDefault(true, new HashSet<>()));
+                categorizedNoDistinctAggsChildren.getOrDefault(true, ImmutableSet.of()),
+                categorizedDistinctAggsChildren.getOrDefault(true, ImmutableSet.of()));
         Set<Slot> needPushInputSlots = ExpressionUtils.getInputSlotSet(Sets.union(
-                categorizedNoDistinctAggsChildren.getOrDefault(false, new HashSet<>()),
-                categorizedDistinctAggsChildren.getOrDefault(false, new HashSet<>())));
+                categorizedNoDistinctAggsChildren.getOrDefault(false, ImmutableSet.of()),
+                categorizedDistinctAggsChildren.getOrDefault(false, ImmutableSet.of())));
 
         Set<Alias> existsAlias =
                 ExpressionUtils.mutableCollect(aggregateOutput, Alias.class::isInstance);