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[Tests][Fizz] Better HTML parsing behavior for Fizz tests (#26570)
In anticipation of making Fiber use the document global for dispatching Float methods that arrive from Flight I needed to update some tests that commonly recreated the JSDOM instance after importing react. This change updates a few tests to only create JSDOM once per test, before importing react-dom/client. Additionally the current act implementation for server streaming did not adequately model streaming semantics so I rewrite the act implementation in a way that better mirrors how a browser would parse incoming HTML. The new act implementation does the following 1. the first time it processes meaningful streamed content it figures out whether it is rendering into the existing document container or if it needs to reset the document. this is based on whether the streamed content contains tags `<html>` or `<body>` etc... 2. Once the streaming container is set it will typically continue to stream into that container for future calls to act. The exception is if the streaming container is the `<head>` in which case it will switch to streaming into the body once it receives a `<body>` tag. This means for tests that render something like a `<div>...</div>` it will naturally stream into the default `<div id="container">...` and for tests that render a full document the HTML will parse like a real browser would (with some very minor edge case differences) I also refactored the way we move nodes from buffered content into the document and execute any scripts we find. Previously we were using window.eval and I switched this to just setting the external script content as script text. Additionally the nonce logic is reworked to be a bit simpler.
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