Allow passing a custom GIT_SSH_COMMAND to setGitImportSettings() so that git fetch,
submodule update, and lfs pull use the same SSH authentication as the initial clone.
This is required for git sources like GitLab that use custom ports and identity files.
Also remove unnecessary SSH retry event tracking and add test coverage.
Enable `HasFactory` on `Environment`, `Project`, `ScheduledTask`, and
`StandaloneDocker`, and add dedicated factories for related models to
stabilize feature/unit tests.
Also bump `visus/cuid2` to `^6.0` and refresh `composer.lock` with the
resulting dependency updates.
Properly escape commit SHA using escapeshellarg() before passing it
to shell commands. Add comprehensive tests for git commit rollback
scenarios including shallow clone, fallback behavior, and HEAD handling.
