Remove deprecated forecast attribute from WeatherEntity

[gjohansson-ST]

Breaking change

The previously deprecated forecast attribute in Weather has now been removed.

Proposed change

Remove deprecated forecast attribute from WeatherEntity

Awaiting:

• Remove hourly weather entity from Aemet #110764
• Remove hourly weather entity from met_eireann #112449
• Remove hourly weather entity from metoffice #112452
• Remove hourly weather entity from NWS #112503

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 #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (weather) you are listed as a code owner for? Thanks!

Code owner commands

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Stale

[frenck]

@gjohansson-ST There is a merge conflict, could you rebase this one?

../Frenck

[emontnemery]

Thanks, @gjohansson-ST 👍

Stale