ref(core): Steamline parseSampleRate utility function

[Lms24]

Just noticed that there's not really a reason to have the two separate warnings. Let's save some bytes.
(we have tests covering this change)

[andreiborza]

Nice!

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.63 KB (-0.07% 🔽)
@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 (-0.02% 🔽)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.07 KB (-0.02% 🔽)
@sentry/browser (incl. Feedback)	37.56 KB (-0.04% 🔽)
@sentry/browser (incl. sendFeedback)	26.19 KB (-0.05% 🔽)
@sentry/browser (incl. FeedbackAsync)	30.56 KB (-0.05% 🔽)
@sentry/react	24.32 KB (-0.05% 🔽)
@sentry/react (incl. Tracing)	35.64 KB (-0.04% 🔽)
@sentry/vue	25.47 KB (-0.04% 🔽)
@sentry/vue (incl. Tracing)	34.47 KB (-0.03% 🔽)
@sentry/svelte	21.76 KB (-0.06% 🔽)
CDN Bundle	24.13 KB (0%)
CDN Bundle (incl. Tracing)	34.06 KB (0%)
CDN Bundle (incl. Tracing, Replay)	67.73 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	72.71 KB (0%)
CDN Bundle - uncompressed	70.98 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	101.02 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	210.64 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	222.94 KB (0%)
@sentry/nextjs (client)	34.87 KB (-0.03% 🔽)
@sentry/sveltekit (client)	33.24 KB (-0.04% 🔽)
@sentry/node	147.41 KB (-0.01% 🔽)