The list() call on Gitlab classes uses pagination per default. If the
number of items exceeds a certain limit, we only get a part of the
results. We can pass "all=True" to the calls in order to disable
pagination and get all results.
If we're looping over the items, though, the recommended way of getting
them is to use a generator object, which works calling list() with
"as_list=False". See documentation for reference:

https://python-gitlab.readthedocs.io/en/v2.10.1/api-usage.html#pagination

Note: the "as_list" argument is deprecated in newer versions of the
python-gitlab library, in favor of the newer "iterator=True":
https://python-gitlab.readthedocs.io/en/v3.6.0/changelog.html#feature
We are using v2.10.1 of the library, though, so this commit also updates
calls using the new way, which is not working with our version.