web: Ensure the swhid url converter is registered soon

The correct behavior was depending on the order in which swh.web django
apps are registered. This should allow to have less entries in the
SWH_BASE_DJANGO_APPS so we can have an instance only serving /api for
example (which is currently not possible).

swh/web/browse/browseurls.py

@@ -5,6 +5,9 @@
 
 from typing import List, Optional
 
+# call this early to ensure all the 'swhid' url path converted is registered
+# so any url registration will work as intended
+import swh.web.utils.url_path_converters  # noqa: F401
 from swh.web.utils.urlsindex import UrlsIndex
 
 browse_urls = UrlsIndex()

swh/web/browse/urls.py

@@ -17,7 +17,6 @@ import swh.web.browse.views.release  # noqa
 import swh.web.browse.views.revision  # noqa
 import swh.web.browse.views.snapshot  # noqa
 from swh.web.utils import origin_visit_types, reverse
-from swh.web.utils.url_path_converters import register_url_path_converters
 
 
 def _browse_help_view(request: HttpRequest) -> HttpResponse:
@@ -45,8 +44,6 @@ def _browse_swhid_iframe_legacy(request: HttpRequest, swhid: str) -> HttpRespons
     return redirect(reverse("browse-swhid-iframe", url_args={"swhid": swhid}))
 
 
-register_url_path_converters()
-
 urlpatterns = [
     url("browse/", _browse_search_view),
     url("browse/help/", _browse_help_view, name="browse-help"),

swh/web/utils/url_path_converters.py

@@ -42,3 +42,6 @@ def register_url_path_converters() -> None:
     """
     if "swhid" not in REGISTERED_CONVERTERS:
         register_converter(SWHIDConverter, "swhid")
+
+
+register_url_path_converters()