feat(core)!: Remove memoBuilder export & WeakSet fallback

[mydea]

All envs targeted for v9 should support WeakSet.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.93 KB	-0.27%	-63 B 🔽
@sentry/browser - with treeshaking flags	21.67 KB	-0.23%	-50 B 🔽
@sentry/browser (incl. Tracing)	35.48 KB	-0.15%	-54 B 🔽
@sentry/browser (incl. Tracing, Replay)	72.75 KB	-0.08%	-53 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	63.19 KB	-0.07%	-44 B 🔽
@sentry/browser (incl. Tracing, Replay with Canvas)	77.15 KB	-0.07%	-53 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	89.55 KB	-0.06%	-51 B 🔽
@sentry/browser (incl. Feedback)	39.72 KB	-0.14%	-54 B 🔽
@sentry/browser (incl. sendFeedback)	27.57 KB	-0.2%	-54 B 🔽
@sentry/browser (incl. FeedbackAsync)	32.33 KB	-0.16%	-52 B 🔽
@sentry/react	25.7 KB	-0.18%	-46 B 🔽
@sentry/react (incl. Tracing)	38.31 KB	-0.14%	-52 B 🔽
@sentry/vue	27.21 KB	-0.19%	-53 B 🔽
@sentry/vue (incl. Tracing)	37.36 KB	-0.15%	-56 B 🔽
@sentry/svelte	23.11 KB	-0.25%	-58 B 🔽
CDN Bundle	24.32 KB	-0.18%	-44 B 🔽
CDN Bundle (incl. Tracing)	35.86 KB	-0.13%	-46 B 🔽
CDN Bundle (incl. Tracing, Replay)	70.96 KB	-0.07%	-46 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	76.14 KB	-0.07%	-49 B 🔽
CDN Bundle - uncompressed	71.24 KB	-0.25%	-178 B 🔽
CDN Bundle (incl. Tracing) - uncompressed	106.71 KB	-0.17%	-178 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	220.78 KB	-0.08%	-178 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	233.64 KB	-0.08%	-178 B 🔽
@sentry/nextjs (client)	38.61 KB	-0.13%	-48 B 🔽
@sentry/sveltekit (client)	36.02 KB	-0.15%	-53 B 🔽
@sentry/node	162.1 KB	-0.04%	-51 B 🔽
@sentry/node - without tracing	98.84 KB	-0.06%	-56 B 🔽
@sentry/aws-serverless	128.66 KB	-0.05%	-60 B 🔽

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