GnuTests: Replace incompat tests & drop obsolete hack

[oech3]

Replace 2 tests not compatible with our binary (using LD_PRELOAD.
Note that it is difficult to make Rust version of those tests. Including them allows to block regression after fixed by other PR without Rust native tests.

Related: #9760 #9893 #9815

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will degrade performance by 7.57%

_{Comparing oech3:no-ld-preload (1d5397d) with main (7654075)¹}

Summary

❌ 2 regressed benchmarks
✅ 280 untouched benchmarks
⏩ 38 skipped benchmarks²

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	cp_large_file[16]	110.7 KB	119.8 KB	-7.57%
❌	Memory	du_wide_tree[(5000, 500)]	1.2 MB	1.2 MB	-3.42%

Footnotes

1. No successful run was found on main (eb482fb) during the generation of this report, so 7654075 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 38 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. ↩