CI: Skip npm package cache if not bootstrapping

No need to "save time on network access"
if there won't be any network access at all!

Co-Authored-By: deedeeg <[email protected]>

Author: aminya

script/vsts/platforms/templates/cache.yml

@@ -47,3 +47,5 @@ steps:
          npm_package_cache | "$(Agent.OS)" | "$(BUILD_ARCH)"
          npm_package_cache
       path: $(Agent.BuildDirectory)/npm_package_cache_dir
+    condition: or(ne(variables['MainNodeModulesRestored'], 'true'), ne(variables['ScriptNodeModulesRestored'], 'true'), ne(variables['ApmNodeModulesRestored'], 'true'))
+    # No need to restore network/package cache if bootstrapping will be skipped!