test(nextjs): Run e2e tests for nextjs-15 in turbopack

[chargome]

closes https://linear.app/getsentry/issue/FE-546/extend-turbopack-e2e-tests

• Updates nextjs-turbo test to actually run latest version
• Updates next-15 test to also run for turbopack (using latest 15.4 canary as we need both turbopack support and ppr support here)

[linear]

FE-546 Extend turbopack e2e tests

[cursor]

Bug: Inconsistent Build Script Causes Errors

The test:build-turbo script is inconsistent with other build commands. It directly calls next build --turbopack instead of pnpm next build or leveraging the main build script. This bypasses standard error handling and output redirection, potentially masking build failures and risking the use of a global next binary. Additionally, unlike other test:build-* scripts, it does not explicitly specify React versions, which could lead to compatibility issues.

dev-packages/e2e-tests/test-applications/nextjs-15/package.json#L14-L15

sentry-javascript/dev-packages/e2e-tests/test-applications/nextjs-15/package.json

Lines 14 to 15 in 3f9d8cb

	"test:build-latest": "pnpm install && pnpm add next@15.0.0-canary.194 && pnpm add react@19.0.0-rc-cd22717c-20241013 && pnpm add react-dom@19.0.0-rc-cd22717c-20241013 && pnpm build",
	"test:build-turbo": "pnpm install && pnpm add next@15.4.2-canary.1 && next build --turbopack",

Fix in Cursor • Fix in Web

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