tsort: use iterative dfs to prevent stack overflows

[Nekrolm]

Rewrite DFS method in iterative way to avoid stack overflows

Closes #8695

PR is on top of #8694
but changes are independent. Only top commit can be cherry-picked, if needed

[sylvestre]

please add a test that trigger the stackoverflow

[codspeed-hq]

CodSpeed Performance Report

Merging #8737 will not alter performance

_{Comparing Nekrolm:tsort-no-recursion (8f0bf8b) with main (5efafd6)}

Summary

✅ 55 untouched
⏩ 1 skipped¹

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)