fix(browser): Ensure explicit parentSpan is considered

[mydea]

Even if parentSpanIsAlwaysRootSpan=true is configured.

Fixes #16769

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.99 kB	-	-
@sentry/browser - with treeshaking flags	23.76 kB	-	-
@sentry/browser (incl. Tracing)	39.04 kB	+0.05%	+16 B 🔺
@sentry/browser (incl. Tracing, Replay)	77.17 kB	+0.02%	+13 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	70.26 kB	+0.02%	+11 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	81.94 kB	+0.02%	+13 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	94.03 kB	+0.02%	+17 B 🔺
@sentry/browser (incl. Feedback)	40.75 kB	-	-
@sentry/browser (incl. sendFeedback)	28.7 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.59 kB	-	-
@sentry/react	25.76 kB	-	-
@sentry/react (incl. Tracing)	41 kB	+0.02%	+6 B 🔺
@sentry/vue	28.37 kB	+0.06%	+16 B 🔺
@sentry/vue (incl. Tracing)	40.87 kB	+0.03%	+9 B 🔺
@sentry/svelte	24.01 kB	-	-
CDN Bundle	25.5 kB	-	-
CDN Bundle (incl. Tracing)	39.12 kB	+0.04%	+14 B 🔺
CDN Bundle (incl. Tracing, Replay)	75.02 kB	+0.03%	+18 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	80.47 kB	+0.02%	+12 B 🔺
CDN Bundle - uncompressed	74.5 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	116.67 kB	+0.04%	+41 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	230.72 kB	+0.02%	+41 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	243.54 kB	+0.02%	+41 B 🔺
@sentry/nextjs (client)	42.64 kB	+0.02%	+7 B 🔺
@sentry/sveltekit (client)	39.51 kB	+0.05%	+17 B 🔺
@sentry/node	154.31 kB	+0.02%	+16 B 🔺
@sentry/node - without tracing	98.63 kB	-0.01%	-1 B 🔽
@sentry/aws-serverless	124.4 kB	-	-

View base workflow run

[s1gr1d]

I checked if we already document this behavior in JSDoc so it's clear to users what happens when they set null - and it's already documented 👍

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