Remove security_dashboard_agentic_adoption feature flag

Lorenz van Herwaardenrequested to merge
lorenzvanherwaarden-cleanup-security-dashboard-agentic-adoption into master

What does this MR do and why?

Removes the security_dashboard_agentic_adoption feature flag. The flag was enabled by default, so the agentic vulnerability management adoption funnel is now generally available on the group and project security dashboards. This removes the flag checks and always renders the funnel panel.

References

Related #611932 (closed)

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