[Journald] Add tests to ensure no data duplication on restart #42596
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Proposed commit message
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Checklist
I have made corresponding changes to the documentationI have made corresponding change to the default configuration filesI have added an entry inCHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.## Disruptive User Impact## Author's ChecklistHow to test this PR locally
Run the new test:
Related issues
## Use cases## Screenshots## Logs