SIENTIAPDE-2012: per-group levels/ignore_models_id filtering

Extends filter_notification_alerts (slot_manager.py) and
filter_notification_reports (formatters.py) to check
receiver_group.get('levels') and receiver_group.get('ignore_models_id'),
mirroring the existing contents/ignore pattern exactly. Closes the gap
SIENTIAPDE-2011 deliberately left open: the query-time union/intersection
filter widens what gets fetched for the union of all active groups, but until
now nothing narrowed each group back down to its own configured slice.

Both checks short-circuit via `not levels_list or ...` / `not
ignore_models_id_list or ...` rather than accessing notification['level']/
['model_id'] directly, so groups that don't configure either field (today's
common case, and every existing unit test fixture) never evaluate the
right-hand side and can't raise KeyError on notifications missing those keys.
ignore_models_id reads via `.get(...) or []`, defensively handling an
explicit `null` in a receiver_groups document from the start (same fix
SIENTIAPDE-2011 needed a follow-up commit for).

Tests:
- 8 new unit tests (4 per file): levels restriction, ignore_models_id
  restriction, neither-configured passthrough, explicit-None safety.
- New e2e test (test_scenario_a_2_1_per_group_levels_and_ignore_models_id)
  against real Mongo/Redis/Temporal: two active groups configured
  differently: SIENTIAPDE-2011's query-time filter widens the fetch to the
  union of both, and this subtask's per-group filter narrows each group back
  to its own levels/ignore_models_id, including the case where a model is
  ignored by only one of the active groups.
- Deduplicated the two e2e suites' identical _extract_html_body helper into
  e2e/helpers.py (extract_html_body), now shared by both.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

orchestrator/activities/formatters.py

@@ -824,6 +824,8 @@ class Formatters(SientiaMonitoring):
                     - group_name (str): Name of the receiver group
                     - contents (list): Content types to include (must contain "reports")
                     - ignore (list, optional): Notification IDs to exclude
+                    - levels (list, optional): Notification levels to include
+                    - ignore_models_id (list, optional): Model IDs to exclude
 
         Returns:
             dict[str, Any]: Filtered receiver groups with their notifications, keyed by group_name.
@@ -847,6 +849,8 @@ class Formatters(SientiaMonitoring):
             already_added_keys = []
 
             ignore_list = receiver_group.get('ignore', [])
+            levels_list = receiver_group.get('levels')
+            ignore_models_id_list = receiver_group.get('ignore_models_id') or []
 
             for notification in notification_package:
                 alert_type = 'reports'
@@ -859,6 +863,11 @@ class Formatters(SientiaMonitoring):
                     alert_type in receiver_group['contents']
                     and notification_id not in ignore_list
                     and key not in already_added_keys
+                    and (not levels_list or notification.get('level') in levels_list)
+                    and (
+                        not ignore_models_id_list
+                        or notification.get('model_id') not in ignore_models_id_list
+                    )
                 ):
                     receiver_groups[group_name]['notifications'].append(notification)
                     already_added_keys.append(key)

orchestrator/activities/slot_manager.py

@@ -396,6 +396,8 @@ class SlotManager(SientiaMonitoring):
                     - group_name (str): Name of the receiver group
                     - contents (list): Alert types to include (core_alerts, persistent_alerts)
                     - ignore (list, optional): Notification IDs to exclude
+                    - levels (list, optional): Notification levels to include
+                    - ignore_models_id (list, optional): Model IDs to exclude
                 - notification_ttl (int): Seconds before considering notification persistent
 
         Returns:
@@ -421,6 +423,8 @@ class SlotManager(SientiaMonitoring):
             already_added_keys = []
 
             ignore_list = receiver_group.get('ignore', [])
+            levels_list = receiver_group.get('levels')
+            ignore_models_id_list = receiver_group.get('ignore_models_id') or []
 
             for notification in notification_package:
                 alert_type = 'do_nothing'
@@ -445,6 +449,11 @@ class SlotManager(SientiaMonitoring):
                     alert_type in receiver_group['contents']
                     and notification_id not in ignore_list
                     and key not in already_added_keys
+                    and (not levels_list or notification.get('level') in levels_list)
+                    and (
+                        not ignore_models_id_list
+                        or notification.get('model_id') not in ignore_models_id_list
+                    )
                 ):
                     receiver_groups[group_name]['notifications'].append(notification)
                     already_added_keys.append(key)