Tests: Explicitly allow usage of git file-based protocol in test cases
Due to CVE-2022-39253, Git 2.30.6 sets protocol.file.allow=user
by
default. The change has also been backported to other Git versions by
distros. This breaks some of our test cases that use the file-based
protocol locally to simulate real workflows without requiring network
access. In these cases the file protocol is safe, so explicitly enable
it in the tests.
Backport: release