ref(core): Add more specific event mechanisms and span origins to openAiIntegration

[Lms24]

Also added the sentry.origin attribute to the openAi spans since it was missing.
mechanism.type now follows the same pattern

ref #17212
ref #17252

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.11 kB	-	-
@sentry/browser - with treeshaking flags	22.68 kB	-	-
@sentry/browser (incl. Tracing)	39.82 kB	-	-
@sentry/browser (incl. Tracing, Replay)	77.92 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	67.77 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	82.62 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	94.73 kB	-	-
@sentry/browser (incl. Feedback)	40.77 kB	-	-
@sentry/browser (incl. sendFeedback)	28.77 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.66 kB	-	-
@sentry/react	25.83 kB	-	-
@sentry/react (incl. Tracing)	41.77 kB	-	-
@sentry/vue	28.59 kB	-	-
@sentry/vue (incl. Tracing)	41.64 kB	-	-
@sentry/svelte	24.14 kB	-	-
CDN Bundle	25.62 kB	-	-
CDN Bundle (incl. Tracing)	39.71 kB	-	-
CDN Bundle (incl. Tracing, Replay)	75.76 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	81.18 kB	-	-
CDN Bundle - uncompressed	74.89 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	117.5 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	231.77 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	244.37 kB	-	-
@sentry/nextjs (client)	43.83 kB	-	-
@sentry/sveltekit (client)	40.27 kB	-	-
@sentry/node-core	47.73 kB	-	-
@sentry/node	146.66 kB	+0.03%	+35 B 🔺
@sentry/node - without tracing	91.83 kB	+0.01%	+2 B 🔺
@sentry/aws-serverless	103.27 kB	-0.01%	-1 B 🔽

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