ESLint Flat Config

[silamon]

Proposed change

Convert the eslint lint and format to use the flat config configuration. (The current .eslint-rc configuration is deprecated in eslint 9.)
Still awaits an eslint release so we don't need to use the latest eslint dev.

Type of change

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

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

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[silamon]

Merging this will book progress in both #20762 and #21574.

[wendevlin]

Thank you 🎉
@silamon can you please resolve the merge conflict?