fix(browser): Flush telemetry when page is hidden

[Lms24]

So far, we only flushed logs, metrics and client reports when the page is hidden (visibilitychange: hidden). This PR generalizes the flushing behaviour to call client.flush(), which in turn flushes all our telemetry. Specifically, errors and spans which previously were unaffected. Logs and metrics will still be flushed because they already listen to client.on('flush'), similarly to the span buffer. I think think this should be a fair change and reduces some bundle size on top :)

Came up while investigating partially sent traces when span streaming is enabled (e.g. child spans already sent but no pageload span).

ref #21805

[github-actions]

size-limit report 📦

⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Path	Size	% Change	Change
@sentry/browser	27.59 kB	-0.11%	-28 B 🔽
@sentry/browser - with treeshaking flags	26.03 kB	-0.1%	-26 B 🔽
@sentry/browser (incl. Tracing)	46.05 kB	-0.06%	-26 B 🔽
@sentry/browser (incl. Tracing + Span Streaming)	47.79 kB	-0.06%	-28 B 🔽
@sentry/browser (incl. Tracing, Profiling)	50.81 kB	-0.05%	-24 B 🔽
@sentry/browser (incl. Tracing, Replay)	85.28 kB	-0.03%	-25 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	74.89 kB	-0.04%	-27 B 🔽
@sentry/browser (incl. Tracing, Replay with Canvas)	89.97 kB	-0.03%	-22 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	102.64 kB	-0.03%	-26 B 🔽
@sentry/browser (incl. Feedback)	44.77 kB	-0.07%	-30 B 🔽
@sentry/browser (incl. sendFeedback)	32.39 kB	-0.09%	-29 B 🔽
@sentry/browser (incl. FeedbackAsync)	37.52 kB	-0.08%	-28 B 🔽
@sentry/browser (incl. Metrics)	28.67 kB	-0.05%	-14 B 🔽
@sentry/browser (incl. Logs)	28.91 kB	-0.09%	-24 B 🔽
@sentry/browser (incl. Metrics & Logs)	29.6 kB	-0.07%	-18 B 🔽
@sentry/react	29.38 kB	-0.11%	-30 B 🔽
@sentry/react (incl. Tracing)	48.35 kB	-0.07%	-30 B 🔽
@sentry/vue	32.82 kB	-0.09%	-27 B 🔽
@sentry/vue (incl. Tracing)	47.91 kB	-0.06%	-25 B 🔽
@sentry/svelte	27.61 kB	-0.11%	-29 B 🔽
CDN Bundle	30 kB	-0.09%	-25 B 🔽
CDN Bundle (incl. Tracing)	47.98 kB	-0.08%	-36 B 🔽
CDN Bundle (incl. Logs, Metrics)	31.57 kB	-0.06%	-18 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics)	49.32 kB	-0.07%	-32 B 🔽
CDN Bundle (incl. Replay, Logs, Metrics)	70.77 kB	-0.03%	-17 B 🔽
CDN Bundle (incl. Tracing, Replay)	85.48 kB	-0.04%	-29 B 🔽
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	86.76 kB	-0.04%	-30 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback)	91.29 kB	-0.03%	-24 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	92.54 kB	-0.03%	-23 B 🔽
CDN Bundle - uncompressed	89.35 kB	-0.08%	-70 B 🔽
CDN Bundle (incl. Tracing) - uncompressed	145.28 kB	-0.05%	-70 B 🔽
CDN Bundle (incl. Logs, Metrics) - uncompressed	94.05 kB	-0.08%	-70 B 🔽
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	149.25 kB	-0.05%	-70 B 🔽
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	218.59 kB	-0.04%	-70 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	264.29 kB	-0.03%	-70 B 🔽
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	268.25 kB	-0.03%	-70 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	277.99 kB	-0.03%	-70 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	281.94 kB	-0.03%	-70 B 🔽
@sentry/nextjs (client)	50.73 kB	-0.06%	-29 B 🔽
@sentry/sveltekit (client)	46.44 kB	-0.05%	-22 B 🔽
@sentry/core/server	77.75 kB	-	-
@sentry/core/browser	64.06 kB	-	-
@sentry/node-core	61.47 kB	+0.01%	+1 B 🔺
@sentry/node	122.82 kB	-0.01%	-1 B 🔽
@sentry/node/import (ESM hook with diagnostics-channel injection)	69.95 kB	-	-
@sentry/node/light	50.45 kB	-0.01%	-1 B 🔽
@sentry/node - without tracing	73.2 kB	-0.01%	-1 B 🔽
@sentry/aws-serverless	84.09 kB	-0.01%	-1 B 🔽
@sentry/cloudflare (withSentry) - minified	180.62 kB	-	-
@sentry/cloudflare (withSentry)	446.93 kB	-	-

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