Auto merge of #23006 - aditj:aditj-patch-7, r=jdm

Added WebDriver DeleteCookies Function

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This change adds DeleteCookies function of the webdriver crate to the servo webdriver server.
See [spec](https://w3c.github.io/webdriver/#delete-all-cookies)

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- [X] These changes fix part of #8623 (GitHub issue number if applicable)

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