fix: only take scheduled full snapshots

[pauldambra]

We currently take a full snapshot when

(in order of increasing frequency)

• rrweb starts
• when the session id or window id changes
• when returning from idle
• on a timer
• when we see a $pageview event

we also infrequently see reports that playback is inconsistent around $pageviews

let's not take that speculative snapshot

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Jul 4, 2024 8:49am

[github-actions]

Size Change: -100 B (-0.01%)

Total Size: 1.15 MB

Filename	Size	Change
dist/array.full.js	317 kB	-25 B (-0.01%)
dist/array.js	154 kB	-25 B (-0.02%)
dist/main.js	155 kB	-25 B (-0.02%)
dist/module.js	154 kB	-25 B (-0.02%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	10.4 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	60.3 kB
dist/surveys.js	65.4 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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