Add external handling in Overkiz AtlanticElectricalHeaterWithAdjustableTemperatureSetPoint

[nyroDev]

Proposed change

This is a proposal/attempt to fix #83594
When external operating mode is used, Auto will be shown in HVAC mode and preset will be set to external.
When external is set as a preset, the new command setSchedulingType will be used.

Needs dependency bump to add SET_SCHEDULING_TYPE command iMicknl/python-overkiz-api#709
iMicknl/python-overkiz-api@v1.7.2...v1.7.3

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Atlantic Calissia no climate entity  #83594
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

Hey there @iMicknl, @vlebourl, @tetienne, 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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[muppet3000]

@nyroDev - I just got a notification about this because of the bug it's tagged against - I think you've tagged the wrong bug in the description.

[nyroDev]

@nyroDev - I just got a notification about this because of the bug it's tagged against - I think you've tagged the wrong bug in the description.

Sorry, I updated the description.

[eichenlauba]

Hey guys! Someone know when this fix will be implemented in further update?

Thanks for your help 🙏🏼

[Quentame]

Some comments to address before merging

[emontnemery]

LGTM, thanks @nyroDev 👍

The requested changes have been implemented