fix(core): Fork scope if custom scope is passed to startSpanManual

[Lms24]

This PR follows up on #14900 and analogously forks an optionally passed custom scope to ensure the active span is only active inside the callback.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.82 KB	-	-
@sentry/browser - with treeshaking flags	21.5 KB	-	-
@sentry/browser (incl. Tracing)	35.5 KB	-	-
@sentry/browser (incl. Tracing, Replay)	72.27 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.78 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	76.53 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	88.54 KB	-	-
@sentry/browser (incl. Feedback)	39.06 KB	-	-
@sentry/browser (incl. sendFeedback)	27.46 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.25 KB	-	-
@sentry/react	25.54 KB	-	-
@sentry/react (incl. Tracing)	38.26 KB	-	-
@sentry/vue	26.95 KB	-	-
@sentry/vue (incl. Tracing)	37.23 KB	-	-
@sentry/svelte	22.97 KB	-	-
CDN Bundle	24.14 KB	-	-
CDN Bundle (incl. Tracing)	35.82 KB	-0.04%	-14 B 🔽
CDN Bundle (incl. Tracing, Replay)	70.44 KB	-0.03%	-16 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	75.58 KB	-0.03%	-18 B 🔽
CDN Bundle - uncompressed	70.4 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.05 KB	+0.01%	+6 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	216.87 KB	+0.01%	+6 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	229.41 KB	+0.01%	+6 B 🔺
@sentry/nextjs (client)	38.38 KB	-	-
@sentry/sveltekit (client)	36.03 KB	-	-
@sentry/node	161.22 KB	-	-
@sentry/node - without tracing	97.04 KB	+0.01%	+4 B 🔺
@sentry/aws-serverless	126.91 KB	+0.01%	+1 B 🔺

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