build: remove symbols' dependency on the Package phase (#16625)

Due to things outside our control, sometimes the Package phase fails
when VPack publication is enabled. Because of this, symbols won't be
published. We still want these builds to be considered "golden" and we
are still shipping them, so we *must* publish symbols.

(cherry picked from commit bcca7aa)
Service-Card-Id: 91719596
Service-Version: 1.20

build/pipelines/templates-v2/pipeline-onebranch-full-release-build.yml

@@ -247,7 +247,7 @@ extends:
 
       - stage: Publish
         displayName: Publish
-        dependsOn: [Build, Package]
+        dependsOn: [Build]
         jobs:
           - template: ./build/pipelines/templates-v2/job-publish-symbols.yml@self
             parameters: