test: speed up `TestVectorizedMergeJoin` by removing some test cases (#14535)
test: speed up `TestVectorizedMergeJoin` by removing some test cases (#14535)


ngaut/tidb,ming-relax/tidb,Cofyc/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,ngaut/tidb,pingcap/tidb,XuHuaiyu/tidb,c4pt0r/tidb,ngaut/tidb,coocood/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,XuHuaiyu/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,Cofyc/tidb,kyle-wang/tidb,kyle-wang/tidb,ming-relax/tidb,ngaut/tidb,coocood/tidb