Refactoring around add-on store Repository classes (#5990)

* Rename repository fixture to test_repository

Also don't remove the built-in repositories. The list was incomplete,
and tests don't seem to require that anymore.

* Get rid of StoreType

The type doesn't have much value, we have constant strings anyways.

* Introduce types.py

* Use slug to determine which repository urls to return

* Simplify BuiltinRepository enum

* Mock GitRepo load

* Improve URL handling and repository creation logic

* Refactor update_repositories

* Get rid of get_from_url

It is no longer used in production code.

* More refactoring

* Address pylint

* Introduce is_git_based property to Repository class

Return all git based URLs, including the Core repository.

* Revert "Introduce is_git_based property to Repository class"

This reverts commit dfd5ad79bf.

* Fold type.py into const.py

Align more with how Supervisor code is typically structured.

* Update supervisor/store/__init__.py

Co-authored-by: Mike Degatano <michael.degatano@gmail.com>

* Apply repository remove suggestion

* Fix tests

---------

Co-authored-by: Mike Degatano <michael.degatano@gmail.com>

tests/store/test_store_manager.py

@@ -203,7 +203,7 @@ async def test_update_unavailable_addon(
 )
 async def test_install_unavailable_addon(
     coresys: CoreSys,
-    repository: Repository,
+    test_repository: Repository,
     caplog: pytest.LogCaptureFixture,
     config: dict[str, Any],
     log: str,