DPL: move to std::span in some tests

[ktf]

No description provided.

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[alibuild]

Error while checking build/O2/fullCI_slc9 for c697006 at 2026-02-24 02:42:

## sw/BUILD/O2-full-system-test-latest/log
command alien-token-init had nonzero exit code 2


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/018590d94744a0c4bdf45b0dc05f8e8009724e82/slc9_x86-64/o2checkcode/1.0-local64/etc/modulefiles
++ cat
--

Full log here.

[github-actions]

This PR did not have any update in the last 30 days. Is it still needed? Unless further action in will be closed in 5 days.