fix(core): Use ai.operationId for Vercel AI V6 operation name mapping

[nicohrubec]

Vercel AI SDK V6 appends functionId to the operation.name span attribute (e.g., ai.streamText myAgent), causing mapVercelAiOperationName to miss the exact-match lookup and leave gen_ai.operation.name unmapped. This fix uses the ai.operationId attribute (which always contains the bare operation like ai.streamText) when present, falling back to operation.name for older Vercel SDK versions. The existing ToolLoopAgent integration test is strengthened with a functionId to prevent regression.

Closes #20284

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	25.73 kB	-	-
@sentry/browser - with treeshaking flags	24.22 kB	-	-
@sentry/browser (incl. Tracing)	42.72 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	47.35 kB	-	-
@sentry/browser (incl. Tracing, Replay)	81.53 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	71.1 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	86.23 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	98.44 kB	-	-
@sentry/browser (incl. Feedback)	42.52 kB	-	-
@sentry/browser (incl. sendFeedback)	30.39 kB	-	-
@sentry/browser (incl. FeedbackAsync)	35.39 kB	-	-
@sentry/browser (incl. Metrics)	27.04 kB	-	-
@sentry/browser (incl. Logs)	27.19 kB	-	-
@sentry/browser (incl. Metrics & Logs)	27.86 kB	-	-
@sentry/react	27.48 kB	-	-
@sentry/react (incl. Tracing)	45.05 kB	-	-
@sentry/vue	30.56 kB	-	-
@sentry/vue (incl. Tracing)	44.58 kB	-	-
@sentry/svelte	25.75 kB	-	-
CDN Bundle	28.41 kB	-	-
CDN Bundle (incl. Tracing)	43.77 kB	-	-
CDN Bundle (incl. Logs, Metrics)	29.79 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	44.84 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	68.6 kB	-	-
CDN Bundle (incl. Tracing, Replay)	80.65 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	81.68 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	86.18 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	87.21 kB	-	-
CDN Bundle - uncompressed	83 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	129.82 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	87.14 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	133.24 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	210.13 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	246.7 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	250.1 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	259.61 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	263 kB	-	-
@sentry/nextjs (client)	47.48 kB	-	-
@sentry/sveltekit (client)	43.2 kB	-	-
@sentry/node-core	57.86 kB	-	-
@sentry/node	174.81 kB	+0.02%	+24 B 🔺
@sentry/node - without tracing	97.63 kB	+0.01%	+9 B 🔺
@sentry/aws-serverless	114.98 kB	+0.01%	+6 B 🔺

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[chargome]

lgtm