Fixup stage dependencies for PBSign scenarios (#30130)

.azure/pipelines/ci.yml

@@ -831,6 +831,15 @@ stages:
             - CodeSign_Xplat_Linux_musl_x64
             - CodeSign_Xplat_Linux_musl_arm
             - CodeSign_Xplat_Linux_musl_arm64
+          - ${{ if eq(variables['PostBuildSign'], 'true') }}:
+            - MacOs_arm64_build
+            - MacOs_x64_build
+            - Linux_x64_build
+            - Linux_arm_build
+            - Linux_arm64_build
+            - Linux_musl_x64_build
+            - Linux_musl_arm_build
+            - Linux_musl_arm64_build
           # In addition to the dependencies above, ensure the build was successful overall.
           - Source_Build
         pool: