Tests are broken on CentOS

Summary

Trying to add a new runner which is CentOS, we can see that multiple tests fail. https://gitlab.com/BuildStream/buildstream/-/jobs/137741349 is the job failing when trying to add a CentOS runner

Steps to reproduce

Run tests on CentOS

What is the current bug behavior?

tests fail

What is the expected correct behavior?

they should succeed

This is done when:

• the tests pass on CentOS
• We run the tests on CentOS everytime to prevent regression

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