Revert next 15 beta upgrade, switch to shadcn charts

[rgarcia]

:rocket:	This description was created by Ellipsis for commit 82226e071efd35cf87cc024a648cc652185287bb

Summary:

Reverted Next.js 15 beta upgrade and switched from @nivo/line to shadcn charts using recharts.

Key points:

• Reverted Next.js 15 beta upgrade to version 14.1.4 in package.json.
• Removed @nivo/line and related packages from package.json.
• Added recharts package in package.json.
• Replaced LineChart component in packages/webapp/components/charts/LineChart.tsx.
• Updated chart data fetching and processing in packages/webapp/app/(detail)/dashboard/clusters/[name]/data.ts.
• Modified chart rendering logic in packages/webapp/app/(detail)/dashboard/clusters/[name]/Content.tsx.
• Updated global styles in packages/webapp/app/globals.css to include new chart colors.
• Removed old LineChart component in packages/webapp/components/charts/Line.tsx.
• Added utility functions for charts in packages/webapp/lib/charts/time.ts and packages/webapp/lib/charts/prom.ts.
• Updated Sentry configuration in packages/webapp/sentry.server.config.ts to enable it only in production.

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