Encode external fizz runtime into chunks eagerly (#26752)

Summary:
in facebook/react#26738 we added nonce to the
ResponseState. Initially it was used in a variety of places but the
version that got merged only included it with the external fizz runtime.
This PR updates the config for the external fizz runtime so that the
nonce is encoded into the script chunks at request creation time.

The rationale is that for live-requests, streaming is more likely than
not so doing the encoding work at the start is better than during flush.
For cases such as SSG where the runtime is not required the extra
encoding is tolerable (not a live request). Bots are an interesting case
because if you want fastest TTFB you will end up requiring the runtime
but if you are withholding until the stream is done you have already
sacrificed fastest TTFB and the marginal slowdown of the extraneous
encoding is hopefully neglibible

I'm writing this so later if we learn that this tradeoff isn't worth it
we at least understand why I made the change in the first place.

DiffTrain build for commit facebook/react@8ea96ef.

Changelog: [Internal]

<< DO NOT EDIT BELOW THIS LINE >>

Reviewed By: sammy-SC

Differential Revision: D45449587

Pulled By: tyao1

fbshipit-source-id: 76a5f34e42db5e9ad5a78b4b8f0d4e3dad2e7fcd

Author: gnoff

packages/react-native/Libraries/Renderer/REVISION

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-491aec5d6113ce5bae7c10966bc38a4a8fc091a8
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