fix(flags): Revert "feat(flags): Enjoy the benefits of /decide?v=4. $feature_flag_called events contain more details such as flag version"

[dmarticus]

Reverts #1838

Oof, v4 responses from /decide were not smart about flags that were just straight disabled, let's roll back to v3

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Mar 21, 2025 0:58am

[greptile-apps]

PR Summary

This PR reverts the /decide endpoint from v4 back to v3 due to issues with how v4 handled disabled feature flags.

• Changed /decide/?v=4 back to /decide/?v=3 in src/posthog-featureflags.ts and related test files
• Removed core-js/features/object/from-entries polyfill from src/entrypoints/array.full.es5.ts as it's no longer needed
• Updated test assertions across multiple files to expect v3 endpoint URLs instead of v4
• Maintains backwards compatibility while fixing feature flag handling for disabled flags
• Test coverage remains comprehensive across different domains and scenarios

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[haacked]

Does this need a bump patch label?

[dmarticus]

Does this need a bump patch label?

oh yeah, wrong label

[github-actions]

Size Change: -22.6 kB (-0.62%)

Total Size: 3.6 MB

Filename	Size	Change
dist/array.full.es5.js	278 kB	-22.6 kB (-7.5%)	✅

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	220 kB
dist/array.full.js	381 kB
dist/array.full.no-external.js	380 kB
dist/array.js	188 kB
dist/array.no-external.js	187 kB
dist/customizations.full.js	14.1 kB
dist/dead-clicks-autocapture.js	14.5 kB
dist/exception-autocapture.js	9.94 kB
dist/external-scripts-loader.js	2.75 kB
dist/main.js	189 kB
dist/module.full.js	381 kB
dist/module.full.no-external.js	380 kB
dist/module.js	189 kB
dist/module.no-external.js	187 kB
dist/posthog-recorder.js	211 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	71.3 kB
dist/surveys.js	76.6 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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