feat!: remove deprecated otel span processor

[giortzisg]

Description

This removes the deprecated span processor.

Issues

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Reminders

• Add GH Issue ID & Linear ID
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Changelog Entry

• remove deprecatedotel.NewSentrySpanProcessor. Users should now use the sentryotlp.NewTraceExporter instead:

// Before
sentry.Init(sentry.ClientOptions{Dsn: dsn, EnableTracing: true, TracesSampleRate: 1.0})

tp := sdktrace.NewTracerProvider(
	sdktrace.WithSpanProcessor(sentryotel.NewSentrySpanProcessor()),
)
otel.SetTextMapPropagator(sentryotel.NewSentryPropagator())
otel.SetTracerProvider(tp)

// After:
sentry.Init(sentry.ClientOptions{
	Dsn: dsn, EnableTracing: true, TracesSampleRate: 1.0,
	Integrations: func(i []sentry.Integration) []sentry.Integration {
		return append(i, sentryotel.NewOtelIntegration())
	},
})

exporter, _ := sentryotlp.NewTraceExporter(ctx, dsn)
tp := sdktrace.NewTracerProvider(sdktrace.WithBatcher(exporter))
otel.SetTracerProvider(tp)

[github-actions]

Semver Impact of This PR

🔴 Major (breaking changes)

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---

Breaking Changes 🛠

• remove deprecatedotel.NewSentrySpanProcessor. Users should now use the sentryotlp.NewTraceExporter instead: by giortzisg in #1307

  // Before
  sentry.Init(sentry.ClientOptions{Dsn: dsn, EnableTracing: true, TracesSampleRate: 1.0})
  
  tp := sdktrace.NewTracerProvider(
  	sdktrace.WithSpanProcessor(sentryotel.NewSentrySpanProcessor()),
  )
  otel.SetTextMapPropagator(sentryotel.NewSentryPropagator())
  otel.SetTracerProvider(tp)
  
  // After:
  sentry.Init(sentry.ClientOptions{
  	Dsn: dsn, EnableTracing: true, TracesSampleRate: 1.0,
  	Integrations: func(i []sentry.Integration) []sentry.Integration {
  		return append(i, sentryotel.NewOtelIntegration())
  	},
  })
  
  exporter, _ := sentryotlp.NewTraceExporter(ctx, dsn)
  tp := sdktrace.NewTracerProvider(sdktrace.WithBatcher(exporter))
  otel.SetTracerProvider(tp)

• Remove the ContextifyFrames integration. The recommended way to add source context is SCM by giortzisg in #1302

Internal Changes 🔧

Deps

• Bump github.com/gofiber/fiber/v2 from 2.52.12 to 2.52.13 in /fiber by dependabot in #1300
• Bump github.com/gofiber/fiber/v2 from 2.52.12 to 2.52.13 in /crosstest by dependabot in #1301
• Bump getsentry/craft from 2.25.2 to 2.26.2 by dependabot in #1293
• Bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.25.2 to 2.26.2 by dependabot in #1294

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