Changelog: New managed dashboard templates, "Big Number" chart type, and dashboard improvements

[ellipsis-dev]

Changelog: Dashboards & Widgets Improvements

Feature:

• Added new Langfuse managed dashboard templates for cost, trace count, score count, and more (see langfuse-dashboards.json).
• Updated descriptions and standardized terminology for existing dashboard templates.
• Introduced new dashboards: "Langfuse Usage Management" and "Langfuse Cost Dashboard" with new widget layouts and metrics.
• Expanded metric options and chart types (including LINE_TIME_SERIES, VERTICAL_BAR, PIE, NUMBER, BAR_TIME_SERIES).

UI/UX:

• Removed the "Beta" label from the Dashboards route for a more polished user experience.
• Added support for the "Big Number (Total Value)" chart type in dashboard widgets (in both widget selection and display).

Files changed:

• worker/src/constants/langfuse-dashboards.json
• web/src/components/layouts/routes.tsx
• web/src/features/widgets/components/SelectWidgetDialog.tsx
• web/src/features/widgets/components/WidgetTable.tsx

Pull Request: langfuse/langfuse#6939

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