tests/misc/coreutils.sh: Fail with invalid binary name

[oech3]

Fixes #10244
Also covers some (but no all of) use case for symlinking binary to /bin/false.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env. tests/env/env is passing on 'main'. Maybe you have to rebase?

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will improve performance by 6.49%

_{Comparing oech3:core-1 (88e1448) with main (5fd3459)}

Summary

⚡ 2 improved benchmarks
✅ 280 untouched benchmarks
⏩ 38 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	du_deep_tree[(100, 3)]	155.8 KB	146.3 KB	+6.49%
⚡	Memory	numfmt_large_numbers_si[10000]	4.9 MB	4.7 MB	+4.01%

Footnotes

1. 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. ↩

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env. tests/env/env is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env. tests/env/env is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/shuf/shuf-reservoir (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/sort/sort-stale-thread-mem (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env. tests/env/env is passing on 'main'. Maybe you have to rebase?

[oech3]

I don't like to have .ends_with("box") in the binary just for test suite. Should be covered by shebang wrapper (at different PR).

[oech3]

shebang does not work...