refactor: amend add_pvi_info to add to provider in place

Author: shihab-dls

src/fastcs/transport/epics/pva/ioc.py

@@ -23,7 +23,7 @@ async def parse_attributes(
 
     for controller_api in root_controller_api.walk_api():
         pv_prefix = controller_pv_prefix(root_pv_prefix, controller_api)
-        provider = add_pvi_info(
+        add_pvi_info(
             provider=provider,
             pv_prefix=pv_prefix,
             controller_api=controller_api,

src/fastcs/transport/epics/pva/pvi.py

@@ -33,13 +33,12 @@ def add_pvi_info(
     pv_prefix: str,
     controller_api: ControllerAPI,
     description: str | None = None,
-) -> StaticProvider:
+) -> None:
     """Add PVI information to given provider."""
     provider.add(
         f"{pv_prefix}:PVI",
         SharedPV(initial=_make_p4p_value(pv_prefix, controller_api, description)),
     )
-    return provider
 
 
 def _make_p4p_value(