Troubleshoot dysfunctional presenters

[luisa-beerboom]

Fixes #3368
maybe.

I've investigated the errors in the logs. They are from a new function of gunicorn (the control interface https://gunicorn.org/guides/gunicornc/).
(By the way, the code that fails is somewhere in ln 98-111 of https://github.com/benoitc/gunicorn/blob/master/gunicorn/ctl/server.py#L98C8-L112C1 after all that is the code wrapped by the try block that adds Control server error to the error message and after it there is an info Control socket listening at %s being locked that never comes. [Errno 13] Permission denied is an os error btw. Probably caused by accessing a file without appropriate rights.)

I've added something to try and fix the gunicorn issue:
A new env setting OPENSLIDES_BACKEND_ENABLE_CONTROL_SOCKET (false by default) that enables the control interface.
If it is enabled the control sockets should be created as openslides-action.ctl and openslides-presenter.ctl.

[luisa-beerboom]

This basically turns off the functionality by default.

Assigning @hjanott for code review, @bastianjoel for testing the client and @peb-adr in case he wants to see if he can manage to connect to it when it is enabled, since I'm not sure at all if it works.

[hjanott]

LGTM

[bastianjoel]

Do not wait for my review.

[peb-adr]

As discussed make target name: open-gunicornc-<MOD>

Otherwise LGTM