fix(browser): Continuously record CLS web vital

[lforst]

Through debugging I found that we were only recording the CLS web vital when we were hiding the tab (so either when switching tabs or when unloading the page).

This is problematic because it result in us not sending CLS values for pageloads at all (or at least with really low probability). We fix this by setting reportAllChanges: true which will continuously update the CLS metric before we send it.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.65 KB (0%)
@sentry/browser (incl. Tracing)	32.68 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay)	68.02 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.42 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.06 KB (+0.01% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.16 KB (+0.02% 🔺)
@sentry/browser (incl. Feedback)	37.66 KB (0%)
@sentry/browser (incl. sendFeedback)	26.21 KB (0%)
@sentry/browser (incl. FeedbackAsync)	30.84 KB (0%)
@sentry/react	24.33 KB (0%)
@sentry/react (incl. Tracing)	35.64 KB (+0.02% 🔺)
@sentry/vue	25.48 KB (0%)
@sentry/vue (incl. Tracing)	34.47 KB (+0.03% 🔺)
@sentry/svelte	21.78 KB (0%)
CDN Bundle	24.13 KB (0%)
CDN Bundle (incl. Tracing)	34.05 KB (+0.02% 🔺)
CDN Bundle (incl. Tracing, Replay)	67.72 KB (+0.02% 🔺)
CDN Bundle (incl. Tracing, Replay, Feedback)	72.93 KB (+0.02% 🔺)
CDN Bundle - uncompressed	70.99 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	101 KB (+0.03% 🔺)
CDN Bundle (incl. Tracing, Replay) - uncompressed	210.61 KB (+0.02% 🔺)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	223.89 KB (+0.01% 🔺)
@sentry/nextjs (client)	34.87 KB (+0.03% 🔺)
@sentry/sveltekit (client)	33.24 KB (+0.03% 🔺)
@sentry/node	146.27 KB (0%)

[mydea]

sounds reasonable to me - I am no expert in web vitals, though, but seems sound to me.