feat(nextjs): Prefix webpack plugin log messages with runtime

[lforst]

Small QoL win. This PR prefixes all webpack plugin log messages in the Next.js SDK with [@sentry/nextjs - Node.js] , [@sentry/nextjs - Edge] or [@sentry/nextjs - Client] depending which one's turn it is.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback)	80.75 KB (added)
@sentry/browser (incl. Tracing, Replay)	72.1 KB (added)
@sentry/browser (incl. Tracing, Replay with Canvas)	75.9 KB (added)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	65.66 KB (added)
@sentry/browser (incl. Tracing)	36.7 KB (added)
@sentry/browser (incl. browserTracingIntegration)	36.7 KB (added)
@sentry/browser (incl. feedbackIntegration)	31.38 KB (added)
@sentry/browser (incl. feedbackModalIntegration)	31.49 KB (added)
@sentry/browser (incl. feedbackScreenshotIntegration)	31.5 KB (added)
@sentry/browser (incl. sendFeedback)	27.45 KB (added)
@sentry/browser	22.62 KB (added)
CDN Bundle (incl. Tracing, Replay, Feedback)	75.09 KB (added)
CDN Bundle (incl. Tracing, Replay)	69.92 KB (added)
CDN Bundle (incl. Tracing)	36.28 KB (added)
CDN Bundle	23.99 KB (added)
CDN Bundle (incl. Tracing, Replay) - uncompressed	219.62 KB (added)
CDN Bundle (incl. Tracing) - uncompressed	109.56 KB (added)
CDN Bundle - uncompressed	71.09 KB (added)
@sentry/react (incl. Tracing, Replay)	72.09 KB (added)
@sentry/react	22.64 KB (added)