ref: Rewrite to use optional chaining & add eslint rule

[mydea]

This adds an eslint rule to enforce usage of optional chaining, to keep things consistent.

It also fixes remaining places that "violate" this.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.01 KB	-0.27%	-63 B 🔽
@sentry/browser - with treeshaking flags	21.68 KB	-0.26%	-56 B 🔽
@sentry/browser (incl. Tracing)	35.46 KB	-0.27%	-95 B 🔽
@sentry/browser (incl. Tracing, Replay)	72.23 KB	-0.15%	-107 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.76 KB	-0.15%	-95 B 🔽
@sentry/browser (incl. Tracing, Replay with Canvas)	76.49 KB	-0.14%	-102 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	88.5 KB	-0.15%	-136 B 🔽
@sentry/browser (incl. Feedback)	39.23 KB	-0.26%	-104 B 🔽
@sentry/browser (incl. sendFeedback)	27.64 KB	-0.24%	-68 B 🔽
@sentry/browser (incl. FeedbackAsync)	32.41 KB	-0.31%	-103 B 🔽
@sentry/react	25.7 KB	-0.26%	-66 B 🔽
@sentry/react (incl. Tracing)	38.23 KB	-0.23%	-87 B 🔽
@sentry/vue	27.15 KB	-0.31%	-84 B 🔽
@sentry/vue (incl. Tracing)	37.26 KB	-0.29%	-109 B 🔽
@sentry/svelte	23.13 KB	-0.25%	-59 B 🔽
CDN Bundle	24.28 KB	-0.3%	-73 B 🔽
CDN Bundle (incl. Tracing)	35.75 KB	-0.29%	-104 B 🔽
CDN Bundle (incl. Tracing, Replay)	70.42 KB	-0.12%	-85 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	75.55 KB	-0.17%	-130 B 🔽
CDN Bundle - uncompressed	70.78 KB	-0.51%	-367 B 🔽
CDN Bundle (incl. Tracing) - uncompressed	105.93 KB	-0.54%	-588 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	216.76 KB	-0.36%	-780 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	229.29 KB	-0.4%	-928 B 🔽
@sentry/nextjs (client)	38.35 KB	-0.23%	-90 B 🔽
@sentry/sveltekit (client)	36 KB	-0.25%	-91 B 🔽
@sentry/node	161.7 KB	-0.05%	-73 B 🔽
@sentry/node - without tracing	97.48 KB	-0.07%	-60 B 🔽
@sentry/aws-serverless	127.34 KB	-0.06%	-76 B 🔽

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