feat(nextjs): Emit low cardinality function span names

[Lms24]

This PR:

• changes the name of the NextJS server action function span to match conventions span name rules (omitting the serverAction/ prefix)
• overrides the span description inference by setting the sentry.description attribute so that span descriptions don't change (i.e. keeping the serverAction/ prefix)
• adds the code.function.name attribute for completeness

ref #23954

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	28.92 kB	added	added
@sentry/browser - with treeshaking flags	27.21 kB	added	added
@sentry/browser - with treeshaking flags tracing without tracing	27.11 kB	added	added
@sentry/browser (incl. Tracing)	50.28 kB	added	added
@sentry/browser (incl. Tracing + Span Streaming)	50.29 kB	added	added
@sentry/browser (incl. Tracing, Profiling)	53.27 kB	added	added
@sentry/browser (incl. Tracing, Replay)	89.77 kB	added	added
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	78.86 kB	added	added
@sentry/browser (incl. Tracing, Replay with Canvas)	94.46 kB	added	added
@sentry/browser (incl. Tracing, Replay, Feedback)	107.47 kB	added	added
@sentry/browser (incl. Feedback)	46.41 kB	added	added
@sentry/browser (incl. sendFeedback)	33.97 kB	added	added
@sentry/browser (incl. FeedbackAsync)	39.08 kB	added	added
@sentry/browser (incl. Metrics)	29.93 kB	added	added
@sentry/browser (incl. Logs)	30.2 kB	added	added
@sentry/browser (incl. Metrics & Logs)	30.87 kB	added	added
@sentry/react	30.67 kB	added	added
@sentry/react (incl. Tracing)	52.6 kB	added	added
@sentry/vue	36.16 kB	added	added
@sentry/vue (incl. Tracing)	52.53 kB	added	added
@sentry/svelte	28.93 kB	added	added
CDN Bundle	30.66 kB	added	added
CDN Bundle (incl. Tracing)	50.78 kB	added	added
CDN Bundle (incl. Logs, Metrics)	32.93 kB	added	added
CDN Bundle (incl. Tracing, Logs, Metrics)	52.74 kB	added	added
CDN Bundle (incl. Replay, Logs, Metrics)	73.62 kB	added	added
CDN Bundle (incl. Tracing, Replay)	88.33 kB	added	added
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	90.29 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback)	94.37 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	96.38 kB	added	added
CDN Bundle - uncompressed	90.73 kB	added	added
CDN Bundle (incl. Tracing) - uncompressed	151.69 kB	added	added
CDN Bundle (incl. Logs, Metrics) - uncompressed	97.31 kB	added	added
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	157.66 kB	added	added
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	226.72 kB	added	added
CDN Bundle (incl. Tracing, Replay) - uncompressed	271.26 kB	added	added
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	277.21 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	284.96 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	290.9 kB	added	added
@sentry/nextjs (client)	54.92 kB	added	added
@sentry/sveltekit (client)	50.7 kB	added	added
@sentry/core/server	37.08 kB	added	added
@sentry/core/browser	13.66 kB	added	added
@sentry/node	128.59 kB	added	added
@sentry/node/import (ESM hook with diagnostics-channel injection)	81.82 kB	added	added
@sentry/node - without tracing	89.55 kB	added	added
@sentry/node - without channel injection	107.53 kB	added	added
@sentry/aws-serverless	97.77 kB	added	added
@sentry/cloudflare (withSentry) - minified	203.01 kB	added	added
@sentry/cloudflare (withSentry)	505.44 kB	added	added

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