[#3] Fix flaky signal tests

[elfenpiff]

Notes for Reviewer

The signal tests, sporadically fails on archlinux and aarch64. This PR tries to fix this.

Pre-Review Checklist for the PR Author

1. [x] Add sensible notes for the reviewer
2. [x] PR title is short, expressive and meaningful
3. [x] Relevant issues are linked
4. [x] Every source code file has the SPDX header SPDX-License-Identifier: $(LICENSE_CODE)
5. [x] Branch follows the naming format (elk-123-introduce-posix-ipc-example)
6. [x] Commits messages are according to this guideline
   • [x] Commit messages have the issue ID ([#123] Add posix ipc example)
   • [x] Commit author matches Eclipse Contributor Agreement (and ECA is signed)
7. [x] Tests follow the best practice for testing
8. [x] Changelog updated in the unreleased section including API breaking changes
9. [x] Assign PR to reviewer
10. [x] All checks have passed (except task-list-completed)

Checklist for the PR Reviewer

• [x] Commits are properly organized and messages are according to the guideline
• [x] Unit tests have been written for new behavior
• [x] Public API is documented
• [x] PR title describes the changes

Post-review Checklist for the PR Author

1. [ ] All open points are addressed and tracked via issues

References

Use either 'Closes #123' or 'Relates to #123' to reference the corresponding issue.

Relates to #3

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1ee834a) 77.35% compared to head (9ce9fd7) 77.35%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #59 +/- ## ======================================= Coverage 77.35% 77.35% ======================================= Files 167 167 Lines 18797 18797 ======================================= Hits 14541 14541 Misses 4256 4256 ```

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