[0.88] Stop re-creating library package roots on every sync

[chrfalch]

Target Branch

0.88

Link to commit or PR to be picked

react/react-native#58597

Description

Fixes an iOS SwiftPM autolinking bug where Xcode kept re-syncing and recreating library package roots, causing “Missing package product” build failures for apps using self-managed libraries with their own Package.swift files. It makes the generated library sync idempotent and ignores Xcode’s own .swiftpm metadata when deciding whether a sync is stale, so repeated builds no longer

[github-actions]

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[fabriziocucci]

Picked manually into 0.88-stable as 9465ef76f7c (cherry-pick of 97cc934dc75 with -x, so the commit records its origin). Authorship is preserved.

CI is green on the resulting branch tip 13d30b643cb: all five workflows pass, Test All at 71 success and 0 failures.