Handle attributes on closing script/style tags

[nickotmazgin]

Summary

• expand the script/style sanitization regex to allow optional trailing attributes on closing tags

Testing

• none (regex-only change)

---

Note

Expand the HTML sanitization regex to match closing </style> and </script> tags with optional trailing attributes.

• Sanitization (extension.js):
  • Update _stripClipboardHtml to use regexes that match closing </style> and </script> tags with optional trailing attributes.

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