In this branch, we will add all cases of source code files which are needed to increase coverage in git-slice-tools unit tests (like normal files, lfs files, synlink files, .gitsliceignore files...)
In each test case, we create a new branch from this branch via Github GraphQL API (ex: upstream-main-<unique-key> or slice-main-<unique-key>) then use that branch in tests instead of using this branch directly