Fix symbol checking test when compiled with debug symbols (backport #1474)

[mergify[bot]]

🦟 Bug fix

Summary

The test that checks for prefixed binary symbols was broken when compiled with DebWithRelInfo since it was checking debugging symbols that broke the heuristics used.

The commit fixes it doing a couple of actions:

• Include the length of the namespace sdf according to the mangling rules: 3sdf
• Check only dynamic symbols being exported

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

---

This is an automatic backport of pull request #1474 done by Mergify.

[codecov[bot]]

Codecov Report

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

Please upload report for BASE (sdf15@cba2108). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## sdf15 #1475 +/- ## ======================================== Coverage ? 92.47% ======================================== Files ? 138 Lines ? 18322 Branches ? 0 ======================================== Hits ? 16943 Misses ? 1379 Partials ? 0 ```

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