chore(deps): upgrade to eslint v9

[HeartSquared]

Why

Eslint 8 is deprecated. Keeping on top of dep updates.

What

• Upgrade to eslint 9
• Revised linting rules to be mostly based on current recommended rules
• Removed eslint-plugin-ssr-friendly as it is not compatible with Eslint flat config (the only option in v9+)
• Removed @stylistic/eslint-plugin as it conflicts too much with prettier
  • It does actually give us better control and nicer looking code, but we can revisit later if we are happy to remove prettier

[changeset-bot]

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Latest commit: 665b350

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[HeartSquared]

Replaced with #5339