minor: use sql to setup test data for joins.slt rather than rust #6656
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Which issue does this PR close?
Follow on to #6642 from @jiangzhx
related to #6302
Rationale for this change
I noticed we could port more of the rust based setup code in #6642 to use sql which makes it clearer what is going on as well as is more concise
What changes are included in this PR?
Port 4 test setups from Rust to SQL
Are these changes tested?
covered by existing tests
Are there any user-facing changes?
no