fix(surveys): 7-point likert scale didn't work with branching logic

[dmarticus]

Changes

A user reported that our 7-point likert scales didn't support branching logic in the PostHog UI, which is good, because posthog-js didn't support them either and would've thrown a runtime error if users tried it.

This change supports handling 7-point scales for our branching logic. Will ship with the PostHog UI changes, but this change should go in first so that we don't have users hitting runtime errors.

Demo of it all working: https://www.loom.com/share/e22de74e2bea4b7cb66fe34343e68916

Checklist

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

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Sep 18, 2024 5:28pm

[github-actions]

Size Change: +512 B (+0.04%)

Total Size: 1.21 MB

Filename	Size	Change
dist/array.full.js	347 kB	+128 B (+0.04%)
dist/array.js	163 kB	+128 B (+0.08%)
dist/main.js	164 kB	+128 B (+0.08%)
dist/module.js	163 kB	+128 B (+0.08%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	10.4 kB
dist/recorder-v2.js	111 kB
dist/recorder.js	111 kB
dist/surveys-preview.js	59.8 kB
dist/surveys.js	66 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	10.3 kB

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