feat(assisted-query): Add metrics search feature flag and forward options

[isaacwang-sentry]

Summary

• Register gen-ai-explore-metrics-search feature flag to gate the metrics AI search bar independently
• Update SearchAgentStartEndpoint to accept the new flag when strategy is "Metrics"
• Forward the full options dict to Seer instead of extracting only model_name, so strategy-specific context (like metric_context) passes through

Test plan

• Verify the gen-ai-explore-metrics-search flag is registered and exposed to the frontend
• Verify the endpoint accepts requests with strategy: "Metrics" when the new flag is enabled
• Verify the full options dict is forwarded to Seer

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: State endpoint missing new metrics feature flag check
  • Added gen-ai-explore-metrics-search flag check to state endpoint to match the start endpoint's feature flag logic, allowing users with only the metrics flag to poll for search agent state.

Or push these changes by commenting:

@cursor push 1df9d6d530

Preview (1df9d6d530)

diff --git a/src/sentry/seer/endpoints/search_agent_state.py b/src/sentry/seer/endpoints/search_agent_state.py
--- a/src/sentry/seer/endpoints/search_agent_state.py
+++ b/src/sentry/seer/endpoints/search_agent_state.py
@@ -81,9 +81,12 @@
                 }
             }
         """
-        if not features.has(
+        has_feature = features.has(
             "organizations:gen-ai-search-agent-translate", organization, actor=request.user
-        ):
+        ) or features.has(
+            "organizations:gen-ai-explore-metrics-search", organization, actor=request.user
+        )
+        if not has_feature:
             return Response(
                 {"detail": "Feature flag not enabled"},
                 status=status.HTTP_403_FORBIDDEN,

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