🐛 :: FirebaseMessaging 의존성을 Tuist 중앙 SPM 그래프로 통합

루트 Package.swift가 firebase-ios-sdk(from: 10.3.0 → 10.29.0)를 관리하는데,
FCM은 별도로 Package.remote(.upToNextMajor(from: "9.5.0"))를 직접 선언해
워크스페이스에 firebase-ios-sdk가 9.6.0/10.29.0 두 버전으로 동시에 존재했음.
GoogleUtilities/GoogleAppMeasurement 등 transitive 의존성까지 통째로 두 번
링크되어 656 duplicate symbols, Missing package product 'FirebaseMessaging'
에러 발생. FCM도 다른 SPM 의존성과 동일하게 .external(name:)로 통일하고
중복 Package.remote 선언 제거.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: leejh08

Plugins/DependencyPlugin/ProjectDescriptionHelpers/Dependency+SPM.swift

@@ -18,13 +18,9 @@ public extension TargetDependency.SPM {
     static let ReactorKit = TargetDependency.external(name: "ReactorKit")
     static let RxGesture = TargetDependency.external(name: "RxGesture")
     static let DGCharts = TargetDependency.external(name: "DGCharts")
-    static let FCM = TargetDependency.package(product: "FirebaseMessaging")
+    static let FCM = TargetDependency.external(name: "FirebaseMessaging")
     static let Pulse = TargetDependency.external(name: "Pulse")
     static let PulseUI = TargetDependency.external(name: "PulseUI")
     static let Nuke = TargetDependency.external(name: "Nuke")
     static let SkeletonView = TargetDependency.external(name: "SkeletonView")
 }
-
-public extension Package {
-    static let FCM = Package.remote(url: "https://github.com/firebase/firebase-ios-sdk", requirement: .upToNextMajor(from: "9.5.0"))
-}