[Enhancement] Test to prohibit importing data into mtmv

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Description

We have added the mtmv function, and at the same time we have disabled the operation of directly importing data into mtmv, including operations such as insert/load. Here, it is necessary to supplement the test case where all load operations are prohibited from importing data into mtmv. The example of insert is as follows.

Solution

CREATE TABLE t1 ( k1 TINYINT, k2 INT not null ) DISTRIBUTED BY HASH(k2) BUCKETS 2 PROPERTIES ( "replication_num" = "1" );

CREATE MATERIALIZED VIEW mv1 BUILD DEFERRED REFRESH AUTO ON MANUAL DISTRIBUTED BY RANDOM BUCKETS 2 PROPERTIES ( 'replication_num' = '1' ) AS SELECT * from t1;

// insert into mtmv test { sql """insert into mv1 values(1,1)""" exception "Not allowed" }

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[ ] Yes I am willing to submit a PR!

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apache / doris