Revert "Re-query for the derivation outputs in the post-build-hook"

This reverts commit 1b1e076033.

Using `queryPartialDerivationOutputMap` assumes that the derivation
exists locally which isn't the case for remote builders.

src/libstore/build/derivation-goal.cc

@@ -899,10 +899,8 @@ void DerivationGoal::buildDone()
                 Logger::Fields{worker.store.printStorePath(drvPath)});
             PushActivity pact(act.id);
             StorePathSet outputPaths;
-            for (auto& [_, maybeOutPath] :
-                 worker.store.queryPartialDerivationOutputMap(drvPath)) {
-                if (maybeOutPath)
-                    outputPaths.insert(*maybeOutPath);
+            for (auto i : drv->outputs) {
+                outputPaths.insert(finalOutputs.at(i.first));
             }
             std::map<std::string, std::string> hookEnvironment = getEnv();