refactor: group patch for load-manifest.js

[vicb]

minor cleanup to group patches for load-manifest.js

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This is part 1 of 3 in a stack made with GitButler:

•  3  refactor: move cache patches to the Next Server astgrep based patches #706
•  2  refactor: group patches for next-server.js #705
•  1  refactor: group patch for load-manifest.js #704 👈

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Latest commit: c1504c9

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commit: c1504c9

[vicb]

Thanks for the review James!