[fix](mtmv) Fix enable_materialized_view_nest_rewrite session variable is useless in some scene

[seawinde]

Proposed changes

This is brought by #34050

if set enable_materialized_view_nest_rewrite = false, as expected, top level materialized view should rewritten fail, but now successfully.

Such as first level materialized view def is

        CREATE MATERIALIZED VIEW level1
        BUILD IMMEDIATE REFRESH COMPLETE ON MANUAL
        DISTRIBUTED BY RANDOM BUCKETS 2
        PROPERTIES ('replication_num' = '1') 
        AS
    SELECT l_orderkey, l_linenumber, l_partkey, o_orderkey, o_custkey
    FROM lineitem_2 INNER JOIN orders_2
    ON l_orderkey = o_orderkey;

second level materialized view def is

        CREATE MATERIALIZED VIEW level2
        BUILD IMMEDIATE REFRESH COMPLETE ON MANUAL
        DISTRIBUTED BY RANDOM BUCKETS 2
        PROPERTIES ('replication_num' = '1') 
        AS
    SELECT
    l_orderkey,
    l_linenumber,
    o_orderkey,
    sum(l_partkey) AS total_revenue,
    max(o_custkey) AS max_discount
    FROM join_mv1
    GROUP BY l_orderkey, l_linenumber, o_orderkey;

if set enable_materialized_view_nest_rewrite = false, only level1 can rewriten succesfully and chosen by cbo
if set enable_materialized_view_nest_rewrite = true, both level1 and level2 can rewriten succesfully and level2 should be chosen by cbo.

This pr fixed this

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[seawinde]

run buildall

[seawinde]

run buildall