Add package version support to /p/ shortlink routing (#17593)

Co-authored-by: Dustin Ingram <[email protected]>

Author: dgw

tests/unit/test_routes.py

@@ -675,6 +675,9 @@ def add_redirect_rule(*args, **kwargs):
         pretend.call("/u/{username}/", "/user/{username}/", domain=warehouse),
         pretend.call("/2fa/", "/manage/account/two-factor/", domain=warehouse),
         pretend.call("/p/{name}/", "/project/{name}/", domain=warehouse),
+        pretend.call(
+            "/p/{name}/{version}/", "/project/{name}/{version}/", domain=warehouse
+        ),
         pretend.call("/pypi/{name}/", "/project/{name}/", domain=warehouse),
         pretend.call(
             "/pypi/{name}/{version}/", "/project/{name}/{version}/", domain=warehouse

warehouse/routes.py

@@ -517,6 +517,9 @@ def includeme(config):
 
     # Packaging
     config.add_redirect("/p/{name}/", "/project/{name}/", domain=warehouse)
+    config.add_redirect(
+        "/p/{name}/{version}/", "/project/{name}/{version}/", domain=warehouse
+    )
     config.add_route(
         "packaging.project",
         "/project/{name}/",