feat: Update vercel ai span names and ops as per new conventions

[AbhiPrasad]

resolves #16454

As per https://www.notion.so/sentry/WIP-Span-layout-of-AI-agents-1fa8b10e4b5d80f0a83dd251a5ea4ab1, we update the span names and ops to better match OpenTelemetry. This should make them more easily accessible to the new agents module view we are building.

Now instead of a span name like generateText.doGenerate, we will show a name like generate_text gpt-4o-mini (which is the OTEL convention for the gen ai span name). Another example, tool calls will show the tool name so you'll get execute_tool getWeather instead of ai.toolCall.

[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)	38.36 kB	-	-
@sentry/browser (incl. Tracing, Replay)	76.47 kB	+0.01%	+1 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.57 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	81.23 kB	-0.01%	-1 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	93.31 kB	-	-
@sentry/browser (incl. Feedback)	40.73 kB	-0.01%	-1 B 🔽
@sentry/browser (incl. sendFeedback)	28.7 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.59 kB	-	-
@sentry/react	25.76 kB	+0.01%	+1 B 🔺
@sentry/react (incl. Tracing)	40.35 kB	-	-
@sentry/vue	28.36 kB	-	-
@sentry/vue (incl. Tracing)	40.21 kB	-0.01%	-1 B 🔽
@sentry/svelte	24.01 kB	-	-
CDN Bundle	25.48 kB	-	-
CDN Bundle (incl. Tracing)	38.53 kB	-	-
CDN Bundle (incl. Tracing, Replay)	74.41 kB	+0.01%	+1 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	79.86 kB	-	-
CDN Bundle - uncompressed	74.41 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	114.1 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	228.07 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	240.89 kB	-	-
@sentry/nextjs (client)	42.01 kB	-	-
@sentry/sveltekit (client)	38.84 kB	-	-
@sentry/node	150.4 kB	+0.09%	+127 B 🔺
@sentry/node - without tracing	98.33 kB	-	-
@sentry/aws-serverless	124.1 kB	-	-

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