Update OS core systemd related test commands and switch to Ubuntu2404 Agents

[peterzhuamazon]

Description

Update OS core systemd related test commands

Issues Resolved

opensearch-project/OpenSearch#17410
#3747

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.04%. Comparing base (e2c2fee) to head (d2ef1af).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5367   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files         202      202           
  Lines        7043     7043           
=======================================
  Hits         6483     6483           
  Misses        560      560           

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[peterzhuamazon]

Pending:

• Resolve ubuntu2404 agents startup issues on EC2  opensearch-ci#533
• Update trivy image scan cleanup commands opensearch-build-libraries#593

[zelinh]

LGTM. Make sure merge it till infra side deployment is completed.