Update environment variable unit tests with Junit 5 features after dropping Java 8 support #2818
Description
We tried to use Junit 5 extensions to update unit tests that depends on preset environment variables (see #2799).
However, junit-pioneer is not compatible with Java 8 (so as other extensions like system-stubs).
We should update unit tests after dropping Java 8 support. See #2724 (comment) for details.