Move initializeFeatures() to testing-utils

This change eliminates the need for setup-codeql.test to import from
feature-flags.test, which makes the former run all tests defined in the
latter.

src/testing-utils.ts

@@ -14,6 +14,7 @@ import * as defaults from "./defaults.json";
 import {
   CodeQLDefaultVersionInfo,
   Feature,
+  featureConfig,
   FeatureEnablement,
 } from "./feature-flags";
 import { Logger } from "./logging";
@@ -263,6 +264,13 @@ export function createFeatures(enabledFeatures: Feature[]): FeatureEnablement {
   };
 }
 
+export function initializeFeatures(initialValue: boolean) {
+  return Object.keys(featureConfig).reduce((features, key) => {
+    features[key] = initialValue;
+    return features;
+  }, {});
+}
+
 /**
  * Mocks the API for downloading the bundle tagged `tagName`.
  *