refactor(router-core): router loadMatches doesn't need async IIFE (2/2)

[Sheraff]

Same as #4830, except this time I didn't get lost in the rebase

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This PR removes a pattern that was probably left behind from a time when it was more complicated, because it is not currently serving a purpose: "an awaited inline new Promise that executes an async IIFE to resolve at the end, or reject any error" is just the same as directly running the code (with a few extra micro task loops)

[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2025-07-30 20:22:12 UTC

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commit: 312dcbf