Remove obsolete check for rain_product_available in Meteo France

[Flapoly]

Proposed change

Meteo France does now allow 1 hour rain forecast to all french cities. Test based on rain_product_available is no more accurate, and in consequence removed

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New integration (thank you!)
• [X] 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 #90397
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [X] The code change is tested and works locally.
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[home-assistant[bot]]

Hey there @hacf-fr, @oncleben31, @quentame, mind taking a look at this pull request as it has been labeled with an integration (meteo_france) you are listed as a code owner for? Thanks!

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[Flapoly]

@Quentame any chance to get this pull request viewed soon ?

[frenck]

Because there hasn't been any activity on this PR for quite some time now, I've decided to close it for being stale.

Feel free to re-open this PR when you are ready to pick up work on it again 👍

../Frenck