src: Remove timezone and locale unleash flags

This removes `image-builder.timezone.enabled` and `image-builder.locale.enabled` gating as both were released to production.

src/test/Components/CreateImageWizard/steps/Oscap/Compliance.test.tsx

@@ -50,6 +50,8 @@ const goToReviewStep = async () => {
   await clickNext(); // Snapshots
   await clickNext(); // Custom repositories
   await clickNext(); // Additional packages
+  await clickNext(); // Timezone
+  await clickNext(); // Locale
   await clickNext(); // Details
   await enterBlueprintName('Compliance test');
   await clickNext(); // Review