DPL Examples: use the new completion policy for parallel processing

[ktf]

This demonstrates how the new policy can be used in conjunction
with wildcards in order to simplify parallelism based on the
subSpecification.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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The following labels are available
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[alibuild]

Error while checking build/O2/fullCI_slc9 for 634c458 at 2026-02-12 09:32:

## sw/BUILD/O2-RTC-test-latest/log
[ERROR] Error Opening cagpu library for GPU Tracker (libO2GPUTrackingCUDA.so)
[ERROR] Error: Could not load GPUReconstruction for specified device: CUDA (2)


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
grep: error-log.txt: binary file matches
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/65be30bb3ba6c36da2f2b384e0fc155cf9e476e0/slc9_x86-64/o2checkcode/1.0-local21/etc/modulefiles
++ cat
--

Full log here.