feat(api): add more sorting to own repository list (#7256)

- Add more sorting options, by leveraging the existing `repo_model.OrderByFlatMap` map, to the `/api/v1/user/repos` endpoint.
- Swagger has been updated.
- Add (non-exhaustive) integration testing.
- Ref: gitnex/GitNex#1266

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7256
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

templates/swagger/v1_json.tmpl

@@ -19361,8 +19361,28 @@
             "in": "query"
           },
           {
+            "enum": [
+              "name",
+              "id",
+              "newest",
+              "oldest",
+              "recentupdate",
+              "leastupdate",
+              "reversealphabetically",
+              "alphabetically",
+              "reversesize",
+              "size",
+              "reversegitsize",
+              "gitsize",
+              "reverselfssize",
+              "lfssize",
+              "moststars",
+              "feweststars",
+              "mostforks",
+              "fewestforks"
+            ],
             "type": "string",
-            "description": "order the repositories by name (default), id, or size",
+            "description": "order the repositories",
             "name": "order_by",
             "in": "query"
           }