feat(deps): update rust crate sentry to 0.49.0 & migrate to new API

[Copilot]

Tests / build is failing because sentry 0.49 changed ClientOptions: it is now non-exhaustive and no longer exposes traces_sample_rate / traces_sampler as struct fields. This PR updates initialization and related assertions to match the new API while keeping existing sampling behavior.

• Sentry options initialization migration

  • Replaced ClientOptions { ... } struct-literal construction with ClientOptions::new() builder chaining.
  • Moved trace sampling configuration to builder methods:
    • custom sampler path → .traces_sampler(...)
    • fixed-rate path (> 0) → .traces_sample_rate(...)
  • Kept before_send logging and environment configuration intact.

• Trace sampling strategy compatibility in tests

  • Updated integration test assertion from removed options().traces_sampler field access to matching options().traces_sampling_strategy against TracesSamplingStrategy::Function(_).

let mut opts = ClientOptions::new()
    .before_send(|event| {
        info!("Sending event to Sentry: {}", event.event_id);
        Some(event)
    })
    .environment(environment);

if let Some(sampler) = self.traces_sampler.as_ref().map(Arc::clone) {
    opts = opts.traces_sampler(move |ctx| sampler(ctx));
} else if traces_sample_rate > 0.0 {
    opts = opts.traces_sample_rate(traces_sample_rate);
}

[intgr]

Grrr wrong branch target, damn GitHub!