feat(dashboards): allow dashboard generation to filter for project and env (#112150)

Adds project and environment filter to dashboard artifact schema

Author: edwardgou-sentry

src/sentry/dashboards/models/generate_dashboard_artifact.py

@@ -173,4 +173,12 @@ class GeneratedDashboard(BaseModel):
     """A complete dashboard definition on a 6-column grid. Widget widths per row must sum to 6. This is the sole output artifact."""
 
     title: str = Field(..., max_length=255)  # Matches serializer
+    projects: list[int] = Field(
+        default=[],
+        description='Project ids to scope the dashboard to. Empty list means "My Projects".',
+    )
+    environment: list[str] = Field(
+        default=[],
+        description="Environment names to filter by (e.g. ['production', 'staging']). Empty list means all environments.",
+    )
     widgets: list[GeneratedWidget] = Field(..., max_items=Dashboard.MAX_WIDGETS)

src/sentry/dashboards/on_completion_hook.py

@@ -37,8 +37,15 @@ def _validate_with_serializer(
 
     if project is None:
         return None
+    # Strip fields that require request-scoped context (project permissions,
+    # environment access) which we don't have in the completion hook.
+    # The serializer validation here targets widget-level correctness.
+    artifact_data = artifact.dict()
+    artifact_data.pop("projects", None)
+    artifact_data.pop("environment", None)
+
     serializer = DashboardSerializer(
-        data=artifact.dict(),
+        data=artifact_data,
         context={
             "organization": organization,
             "request": SimpleNamespace(user=None),  # mock request to satisfy serializer