test(examples): add e2e test to supabase and strapi-v4 examples

[alicanerdurmaz]

End-to-end (e2e) tests are added to data-provider-supabase, data-provider-strapi-v4 examples.
Adding e2e tests to our examples will prevent us from introducing bugs when developing new features.

Please check all items below before review.

• Corresponding issues are created/updated or not needed
• Docs are updated/provided or not needed
• Examples are updated/provided or not needed
• TypeScript definitions are updated/provided or not needed
• Tests are updated/provided or not needed
• Changesets are provided or not needed

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Latest commit: 32af68a

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