Scripts: Remove default type attribute from tags.
`SCRIPT`, `STYLE`, and stylesheet `LINK` tags do not require a type attribute since the HTML5 standard was released in 2008. Removing the type attribute simplifies logic and normalizes the produced HTML content.
Developed in https://github.com/WordPress/wordpress-develop/pull/10658.
Follow-up to [46164].
Props hardikhuptechdev, jonsurrell, dmsnell, westonruter.
Fixes #64428. See #59883, #64442.
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