[lexical-website] Bug Fix: add allow-popups-to-escape-sandbox to iframe sandbox flags

[etrepum]

Description

When playing with the examples on the website, clicking the "Fork on StackBlitz" button previously opened a blocked popup. With this sandbox flag, the popup loads without being blocked by cross-origin-opener-policy. Can reproduce with Chrome, Firefox and Safari on mac.

Test plan

Before

• Start an example from the homepage by clicking "Run Project" and then "Fork on StackBlitz"
• The pop-up will be blocked

After

• Start an example from the preview site by clicking "Run Project" and then "Fork on StackBlitz"
• The pop-up will not be blocked

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Name	Status	Preview	Comments	Updated (UTC)
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