Self hashjoin SQL test for duckdb-vortex

[myrrc]

Testcase which currently breaks #6627

[0ax1]

lgtm, one q. was the file supposed to be named hasjoin or hashjoin?

[codspeed-hq]

Merging this PR will improve performance by 12.36%

⚡ 2 improved benchmarks
✅ 952 untouched benchmarks
⏩ 1466 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	map_each[BufferMut<i32>, 128]	858.1 ns	770.6 ns	+11.36%
⚡	Simulation	bitwise_not_vortex_buffer_mut[128]	530.3 ns	471.9 ns	+12.36%

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_{Comparing myrrc/hashjoin-test (c1b34f2) with develop (b10b4f4)}

Footnotes

1. 1466 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩