ref(react): Use WeakSet to keep track of navigation instrumented clients

[andreiborza]

This came up in the review for solidjs but is also applicable to react.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.73 KB (0%)
@sentry/browser (incl. Tracing)	32.76 KB (0%)
@sentry/browser (incl. Tracing, Replay)	68.2 KB (0%)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.63 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.25 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.32 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback, metrics)	86.13 KB (0%)
@sentry/browser (incl. metrics)	25.9 KB (0%)
@sentry/browser (incl. Feedback)	37.74 KB (0%)
@sentry/browser (incl. sendFeedback)	26.31 KB (0%)
@sentry/browser (incl. FeedbackAsync)	30.73 KB (0%)
@sentry/react	24.45 KB (0%)
@sentry/react (incl. Tracing)	35.78 KB (+0.02% 🔺)
@sentry/vue	25.71 KB (0%)
@sentry/vue (incl. Tracing)	34.58 KB (0%)
@sentry/svelte	21.86 KB (0%)
CDN Bundle	23.06 KB (0%)
CDN Bundle (incl. Tracing)	34.48 KB (0%)
CDN Bundle (incl. Tracing, Replay)	68.31 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	73.31 KB (0%)
CDN Bundle - uncompressed	68 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	102.1 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	212 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	224.37 KB (0%)
@sentry/nextjs (client)	35.12 KB (0%)
@sentry/sveltekit (client)	33.37 KB (0%)
@sentry/node	114.66 KB (0%)
@sentry/aws-serverless	103.37 KB (0%)