refactor: use local SDK path in kit Xcode projects

[thomson-t]

Summary

• Convert kit SPM dependencies from remote GitHub references (XCRemoteSwiftPackageReference) to local path references (XCLocalSwiftPackageReference) pointing to the monorepo root
• Kits now build against the local mParticle Apple SDK source instead of fetching from GitHub
• Affected kits: FirebaseGA4 (11, 12), Firebase (11, 12), UrbanAirship (19, 20)

Test plan

• Open each affected kit Xcode project and verify it resolves the local SDK package
• Build each kit scheme for iOS and tvOS
• Run kit unit tests

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Build configuration only, but it changes how multiple kit Xcode projects resolve the core SDK dependency (remote GitHub branch -> local relative path), which can break builds for consumers/CI if the repo layout or package resolution differs.

Overview
Updates several kit Xcode projects (Firebase GA4 11/12, Firebase 11/12, UrbanAirship 19/20) to stop fetching mparticle-apple-sdk from GitHub and instead reference it via XCLocalSwiftPackageReference with relativePath = "../../..".

All mParticle-Apple-SDK product dependencies are rewired to this local package reference while leaving other remote dependencies (e.g. firebase-ios-sdk, ios-library) unchanged.

^{Reviewed by Cursor Bugbot for commit 49aa07e. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.75 MB	1.75 MB	+N/A
Executable Impact	848 bytes	848 bytes	+N/A
XCFramework Size	6.38 MB	6.38 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (main):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6532}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6532}