feat(nextjs): added webpack treeshaking flags as config

[github-actions]

Note

The pull request "feat(nextjs): added webpack treeshaking flags as config" was created by @logaretm but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

This PR updates the Sentry Next.js integration to improve tree-shaking configuration and add new options for finer control over what SDK code is included in the final bundle.

The most significant changes are:

• Renaming of the debugLogs option to debugLogging
• Added several new tree-shaking flags for better user DX.

[linear]

JS-1259