chore(performance-trace-details): Adding feature flag. (#60714)

Added flag for [Tracing w/o perf
v0.](https://www.notion.so/sentry/Traces-in-Sentry-V0-feb151b3582b4eb482199ecbeb6f8e33)

Co-authored-by: Abdullah Khan <abdullahkhan@PG9Y57YDXQ.local>

src/sentry/conf/server.py

@@ -1725,6 +1725,8 @@ SENTRY_FEATURES: dict[str, bool | None] = {
     "organizations:performance-issues-render-blocking-assets-detector": False,
     # Enable MN+1 DB performance issue type
     "organizations:performance-issues-m-n-plus-one-db-detector": False,
+    # Enable trace details page with embedded spans
+    "organizations:performance-trace-details": False,
     # Enable FE/BE for tracing without performance
     "organizations:performance-tracing-without-performance": True,
     # Enable database view powered by span metrics

src/sentry/features/__init__.py

@@ -165,6 +165,7 @@ default_manager.add("organizations:performance-trends-new-data-date-range-defaul
 default_manager.add("organizations:performance-metrics-backed-transaction-summary", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:performance-slow-db-issue", OrganizationFeature, FeatureHandlerStrategy.INTERNAL)
 default_manager.add("organizations:performance-tracing-without-performance", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
+default_manager.add("organizations:performance-trace-details", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:performance-database-view", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:performance-database-view-percentiles", OrganizationFeature, FeatureHandlerStrategy.REMOTE)
 default_manager.add("organizations:performance-database-view-query-source", OrganizationFeature, FeatureHandlerStrategy.REMOTE)