[Release] Update instructions with tips for integration (#12792)

Author: ncooke3

FirebaseCore/CHANGELOG.md

@@ -1,3 +1,7 @@
+# Unreleased
+- [Zip Distribution] Update zip integration instructions with tips for
+  preserving symlinks and protecting code signatures.
+
 # Firebase 10.24.0
 - Fix validation issue for macOS and macCatalyst XCFrameworks related to
   framework directory structure. (#12587)

ReleaseTooling/Template/README.md

@@ -4,6 +4,15 @@ This directory contains the full Firebase Apple distribution, packaged as static
 xcframeworks that include support for the iOS, tvOS, macOS, watchOS and Catalyst
 platforms.
 
+# Tips for Integrating
+- It's recommended to remove your existing Firebase XCFramework
+installation before integrating a new version of XCFrameworks. This ensures
+that outdated files and directories from the existing installation do not
+break the code signature of the new installation.
+- If the integration is performed programmatically, ensure that the
+XCFrameworks are copied in a way that preserves symlinks (e.g. `cp -rP`,
+`rsync -a`).
+
 # Integration Instructions
 
 Each Firebase component requires several xcframeworks in order to function