chore: upgrade rrweb to 2.0.0-alpha.12

[daibhin]

Changes

• Upgrade rrweb to v2.0.0-alpha.12
• Reapply relevant patches
  • https://github.com/PostHog/posthog-js/pull/971 - no longer needed (merged in new version)
  • https://github.com/PostHog/posthog-js/pull/1075 - skipped (replaced by more recent patch changes)
  • https://github.com/PostHog/posthog-js/pull/1082 - reapplied

Might do a few quick tests locally to see if everything still generally works

Checklist

• [x] Tests for new code (see advice on the tests we use)
• [x] Accounted for the impact of any changes across different browsers
• [x] Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[github-actions[bot]]

Size Change: -5.26 kB (-1%)

Total Size: 939 kB

Filename	Size	Change
dist/array.full.js	223 kB	-1.78 kB (-1%)
dist/array.js	124 kB	+69 B (0%)
dist/es.js	125 kB	+69 B (0%)
dist/module.js	125 kB	+69 B (0%)
dist/recorder-v2.js	105 kB	-1.84 kB (-2%)
dist/recorder.js	105 kB	-1.84 kB (-2%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12.1 kB
dist/surveys-module-previews.js	62 kB
dist/surveys.js	58.3 kB

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