gitlab: Use all=True in most list() calls (#4491)

If `all=True` is not set then by default only 20 records will be
returned when calling `list()`. Use `all=True` so that all records
will be returned.

For the `list()` use where do not desire to retrieve all entries then
use`all=False` to show explicityly that we don't want to get all of
the entries.

Fixes: #3729
Fixes: #4460

changelogs/fragments/4491-specify_all_in_list_calls.yaml

@@ -0,0 +1,23 @@
+bugfixes:
+  - >
+    gitlab_group_members - handle more than 20 groups when finding a group
+    (https://github.com/ansible-collections/community.general/pull/4491,
+    https://github.com/ansible-collections/community.general/issues/4460,
+    https://github.com/ansible-collections/community.general/issues/3729).
+  - >
+    gitlab_group - improve searching for projects inside group on deletion
+    (https://github.com/ansible-collections/community.general/pull/4491).
+  - >
+    gitlab_hook - handle more than 20 hooks when finding a hook
+    (https://github.com/ansible-collections/community.general/pull/4491).
+  - >
+    gitlab_project - handle more than 20 namespaces when finding a namespace
+    (https://github.com/ansible-collections/community.general/pull/4491).
+  - >
+    gitlab_project_members - handle more than 20 projects and users when
+    finding a project resp. user
+    (https://github.com/ansible-collections/community.general/pull/4491).
+  - >
+    gitlab_user - handle more than 20 users and SSH keys when finding a user
+    resp. SSH key
+    (https://github.com/ansible-collections/community.general/pull/4491).