✨(project) add custom js support via config

From the config, we can add custom JS file URL
to be included in the frontend.

src/backend/core/api/viewsets.py

@@ -2197,6 +2197,7 @@ class ConfigView(drf.views.APIView):
             "ENVIRONMENT",
             "FRONTEND_CSS_URL",
             "FRONTEND_HOMEPAGE_FEATURE_ENABLED",
+            "FRONTEND_JS_URL",
             "FRONTEND_THEME",
             "MEDIA_BASE_URL",
             "POSTHOG_KEY",

src/backend/core/tests/test_api_config.py

@@ -24,6 +24,7 @@ pytestmark = pytest.mark.django_db
     COLLABORATION_WS_NOT_CONNECTED_READY_ONLY=True,
     CRISP_WEBSITE_ID="123",
     FRONTEND_CSS_URL="http://testcss/",
+    FRONTEND_JS_URL="http://testjs/",
     FRONTEND_THEME="test-theme",
     MEDIA_BASE_URL="http://testserver/",
     POSTHOG_KEY={"id": "132456", "host": "https://eu.i.posthog-test.com"},
@@ -49,6 +50,7 @@ def test_api_config(is_authenticated):
         "ENVIRONMENT": "test",
         "FRONTEND_CSS_URL": "http://testcss/",
         "FRONTEND_HOMEPAGE_FEATURE_ENABLED": True,
+        "FRONTEND_JS_URL": "http://testjs/",
         "FRONTEND_THEME": "test-theme",
         "LANGUAGES": [
             ["en-us", "English"],