fix(api): enforce mutual exclusivity between data and form options

[Suraj-Self (suraj-self)]

Summary

• Validate data, form, and multipart by presence instead of truthiness.
• Reject data="" together with form.

Fixes: microsoft/playwright#43059

[Suraj-Self (suraj-self)]

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[Pavel Feldman (pavelfeldman)]

Copilot resolve the merge conflicts in this pull request

[Pavel Feldman (pavelfeldman)]

Copilot resolve the merge conflicts in this pull request