OpenMLDB
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refactor `sql_cmd_test` & `mini_cluster`
the overall structure of sql_cmd_test & mini_cluster is a mess, mix of global variables and reference over different test case.
It's hard to maintain and add new test case easily
who is the owner of those code?
who is the owner of those code?
I'll rewrite a little in #1380 , but somebody may have a more detailed recheck