ci: stop checking allow-collaboration

I heard rumoours this is mostly unnecessary to check nowdays since it is
the default.

The real reason is that it crashes sometimes:

$ ci-fairy check-merge-request --require-allow-collaboration --junit-xml=results.xml
Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/gitlab/exceptions.py", line 344, in wrapped_f
    return f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/gitlab/mixins.py", line 125, in get
    server_data = self.gitlab.http_get(path, **kwargs)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/gitlab/client.py", line 813, in http_get
    result = self.http_request(
             ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/gitlab/client.py", line 779, in http_request
    raise gitlab.exceptions.GitlabHttpError(
gitlab.exceptions.GitlabHttpError: 403: 403 Forbidden
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/bin/ci-fairy", line 8, in <module>
    sys.exit(ci_fairy())
             ^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1082, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1697, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1443, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 788, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/ci_fairy.py", line 1795, in check_merge_request
    mr = p.mergerequests.get(merge_request_iid)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/gitlab/v4/objects/merge_requests.py", line 523, in get
    return cast(ProjectMergeRequest, super().get(id=id, lazy=lazy, **kwargs))
                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/gitlab/exceptions.py", line 346, in wrapped_f
    raise error(e.error_message, e.response_code, e.response_body) from e
gitlab.exceptions.GitlabGetError: 403: 403 Forbidden

Observed in https://gitlab.freedesktop.org/elliot_chen/weston/-/jobs/86174879

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

.gitlab-ci.yml

@@ -116,7 +116,6 @@ check-commit:
   stage: "Merge request checks"
   script:
     - ci-fairy check-commits --signed-off-by --junit-xml=results.xml
-    - ci-fairy check-merge-request --require-allow-collaboration --junit-xml=results.xml
   variables:
     GIT_DEPTH: 100
   artifacts: