[fix](mtmv)fix mtmv dead lock (#37009) #37133
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Cause of occurrence： - dropBaseTable: Holding db's writeLock ,notify mtmv alter status to schema_change,need mv's writeLock - task(insert overwrite):Holding mv's readLock,when generage plan need db's readLock fix: - mtmv alter status to schema_change need mv's writeMvLock instead of mv's writeLock
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pick #37009