chore(metrics): Remove custom manager for dashboard widgets (#77233)

Removes custom manager for dashboard widgets, since it was added for
span based attribute metrics.

Signed-off-by: Vjeran Grozdanic <[email protected]>

Author: vgrozdanic

src/sentry/models/dashboard_widget.py

@@ -1,11 +1,10 @@
 from __future__ import annotations
 
 from enum import Enum
-from typing import Any, ClassVar
+from typing import Any
 
 from django.contrib.postgres.fields import ArrayField as DjangoArrayField
 from django.db import models
-from django.db.models import Q
 from django.utils import timezone
 from django.utils.translation import gettext_lazy
 
@@ -19,9 +18,6 @@
     sane_repr,
 )
 from sentry.db.models.fields import JSONField
-from sentry.db.models.manager.base import BaseManager
-from sentry.db.models.manager.base_query_set import BaseQuerySet
-from sentry.models.organization import Organization
 
 ON_DEMAND_ENABLED_KEY = "enabled"
 
@@ -242,22 +238,6 @@ class Meta:
     __repr__ = sane_repr("extraction_state", "spec_hashes")
 
 
-class DashboardWidgetManager(BaseManager["DashboardWidget"]):
-    def get_for_metrics(
-        self, organization: Organization, metric_mris: list[str]
-    ) -> BaseQuerySet[DashboardWidget]:
-        widget_query_query = Q()
-        for metric_mri in metric_mris:
-            widget_query_query |= Q(aggregates__element_contains=metric_mri)
-
-        widget_ids = (
-            DashboardWidgetQuery.objects.filter(widget__dashboard__organization=organization)
-            .filter(widget_query_query)
-            .values_list("widget_id", flat=True)
-        )
-        return self.filter(id__in=widget_ids)
-
-
 @region_silo_model
 class DashboardWidget(Model):
     """
@@ -285,7 +265,6 @@ class DashboardWidget(Model):
     dataset_source = BoundedPositiveIntegerField(
         choices=DatasetSourcesTypes.as_choices(), default=DatasetSourcesTypes.UNKNOWN.value
     )
-    objects: ClassVar[DashboardWidgetManager] = DashboardWidgetManager()
 
     class Meta:
         app_label = "sentry"