Don't raise Overkiz user flow unique_id check

[iMicknl]

Proposed change

Some users face issues where the Config Flow raises an exception Flow aborted: already_in_progress when their gateway is also discovered via zeroconf.

Fixes #133283
Fixes #127986

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[home-assistant]

Hey there @vlebourl, @tetienne, @nyroDev, @Tronix117, @alexfp14, mind taking a look at this pull request as it has been labeled with an integration (overkiz) you are listed as a code owner for? Thanks!

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homeassistant/components/overkiz/config_flow.py:79

• The new behavior introduced by setting raise_on_progress=False should be covered by tests to ensure it works as expected and doesn't introduce regressions.

await self.async_set_unique_id(gateway_id, raise_on_progress=False)