Add VulnerabilitiesByAgePanel to project new security dashboard
## TL;DR
Add VulnerabilitiesByAgePanel to ProjectSecurityDashboardNew, guarded behind feature flag `project_vulnerabilities_by_age_chart` and with passing the correct scope.
## Implementation Details
1. In ProjectSecurityDashboardNew component, add VulnerabilitiesByAgePanel to the dashboard config, guarded behind the feature flag `project_vulnerabilities_by_age_chart`.
2. Pass 'project' scope. In GroupSecurityDashboardNew update the config so it passes 'group' scope
3. Add and update tests
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