Robbert Müller 7a156059e9 Switch on/off all lights, and wait for the result (#27078)
* Switch on/off all lights, and wait for the result

Reuses the parallel_updates semaphore.
This is a small crutch which serializes platforms which already do tis
for updates. Platforms which can parallelize everything, this makes it
go faster

* Fix broken unittest

With manual validation, with help from @frenck, we found out that the
assertions are wrong and the test should be failing.

The sequence requested is
OFF
ON

without cancelation, this code should result in:
off,off,off,on,on,on

testable, by adding a `await hass.async_block_till_done()` between the
off and on call.

with cancelation. there should be less off call's so
off,on,on,on

* Adding tests for async_request_call

* Process review feedback

* Switch gather with wait

* 👕 running black
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Home Assistant |Chat Status|
=================================================================================

Home Assistant is a home automation platform running on Python 3. It is able to track and control all devices at home and offer a platform for automating control.

To get started:

.. code:: bash

    python3 -m pip install homeassistant
    hass --open-ui

Check out `home-assistant.io <https://home-assistant.io>`__ for `a
demo <https://home-assistant.io/demo/>`__, `installation instructions <https://home-assistant.io/getting-started/>`__,
`tutorials <https://home-assistant.io/getting-started/automation-2/>`__ and `documentation <https://home-assistant.io/docs/>`__.

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Featured integrations
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   :target: https://home-assistant.io/demo/
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   :target: https://home-assistant.io/integrations/
Description
🏡 Open source home automation that puts local control and privacy first.
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