feat(core)!: Remove endTimestamp from SentrySpanArguments

[msonnb]

What

Removes the endTimestamp property from SentrySpanArguments and related dead code in SentrySpan and _startChildSpan.

Why

StartSpanOptions never declared endTimestamp, but parseSentrySpanArguments spreads the user's options, so users could ignore TS and have the span to end immediately by adding the endTimestamp property.

Closes #21405

[msonnb]

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size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	30.26 kB	-0.28%	-82 B 🔽
@sentry/browser - with treeshaking flags	28.44 kB	-0.38%	-108 B 🔽
@sentry/browser - with treeshaking flags tracing without tracing	26.78 kB	-0.33%	-86 B 🔽
@sentry/browser (incl. Tracing)	48.47 kB	+1.39%	+662 B 🔺
@sentry/browser (incl. Tracing + Span Streaming)	48.48 kB	+1.38%	+659 B 🔺
@sentry/browser (incl. Tracing, Profiling)	51.36 kB	-2.27%	-1.19 kB 🔽
@sentry/browser (incl. Tracing, Replay)	87.89 kB	+0.81%	+705 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	77.27 kB	+0.86%	+653 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	92.6 kB	+0.76%	+693 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	105.28 kB	+0.7%	+722 B 🔺
@sentry/browser (incl. Feedback)	47.58 kB	-0.22%	-101 B 🔽
@sentry/browser (incl. sendFeedback)	35.08 kB	-0.26%	-90 B 🔽
@sentry/browser (incl. FeedbackAsync)	40.23 kB	-0.27%	-108 B 🔽
@sentry/browser (incl. Metrics)	31.29 kB	-0.38%	-117 B 🔽
@sentry/browser (incl. Logs)	31.55 kB	-0.34%	-105 B 🔽
@sentry/browser (incl. Metrics & Logs)	32.24 kB	-0.27%	-85 B 🔽
@sentry/react	32.06 kB	-0.27%	-86 B 🔽
@sentry/react (incl. Tracing)	50.65 kB	+1.18%	+588 B 🔺
@sentry/vue	35.28 kB	-0.49%	-171 B 🔽
@sentry/vue (incl. Tracing)	50.41 kB	+1.19%	+591 B 🔺
@sentry/svelte	30.28 kB	-0.29%	-86 B 🔽
CDN Bundle	31.52 kB	-2.54%	-819 B 🔽
CDN Bundle (incl. Tracing)	48.74 kB	+1.27%	+607 B 🔺
CDN Bundle (incl. Logs, Metrics)	33.75 kB	-0.39%	-132 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics)	50.72 kB	+2.56%	+1.26 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics)	74.3 kB	+1.47%	+1.07 kB 🔺
CDN Bundle (incl. Tracing, Replay)	86.34 kB	+0.71%	+607 B 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	88.25 kB	+1.42%	+1.24 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	92.04 kB	+0.53%	+484 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	94.06 kB	+1.3%	+1.2 kB 🔺
CDN Bundle - uncompressed	93.59 kB	-2.39%	-2.28 kB 🔽
CDN Bundle (incl. Tracing) - uncompressed	146.36 kB	+1.94%	+2.78 kB 🔺
CDN Bundle (incl. Logs, Metrics) - uncompressed	100.06 kB	-0.45%	-444 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	152.22 kB	+3.16%	+4.65 kB 🔺
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	228.98 kB	+1.69%	+3.79 kB 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	265.61 kB	+1.06%	+2.77 kB 🔺
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	271.45 kB	+1.75%	+4.65 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	279.31 kB	+1%	+2.76 kB 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	285.14 kB	+1.66%	+4.64 kB 🔺
@sentry/nextjs (client)	53.21 kB	+1.12%	+589 B 🔺
@sentry/sveltekit (client)	48.88 kB	+1.28%	+613 B 🔺
@sentry/core/server	65.42 kB	-0.55%	-358 B 🔽
@sentry/core/browser	51.74 kB	-0.5%	-259 B 🔽
@sentry/node	117.85 kB	-1.33%	-1.58 kB 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)	0 B	added	added
@sentry/node - without tracing	82.01 kB	-1.69%	-1.41 kB 🔽
@sentry/aws-serverless	91.38 kB	-1.48%	-1.36 kB 🔽
@sentry/cloudflare (withSentry) - minified	213.89 kB	-0.47%	-996 B 🔽
@sentry/cloudflare (withSentry)	528.61 kB	-0.41%	-2.16 kB 🔽

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