fix: sanitize set_once properties

[mariusandra]

Changes

• sanitize_properties was not being run on the properties gathered for $set_once. Now it is
• Resolves https://posthoghelp.zendesk.com/agent/tickets/16580

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	Oct 11, 2024 0:08am

[github-actions]

Size Change: +522 B (+0.02%)

Total Size: 2.82 MB

Filename	Size	Change
dist/array.full.js	353 kB	+58 B (+0.02%)
dist/array.full.no-external.js	352 kB	+58 B (+0.02%)
dist/array.js	168 kB	+58 B (+0.03%)
dist/array.no-external.js	167 kB	+58 B (+0.03%)
dist/main.js	169 kB	+58 B (+0.03%)
dist/module.full.js	353 kB	+58 B (+0.02%)
dist/module.full.no-external.js	352 kB	+58 B (+0.02%)
dist/module.js	168 kB	+58 B (+0.03%)
dist/module.no-external.js	167 kB	+58 B (+0.03%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	191 kB
dist/exception-autocapture.js	10.5 kB
dist/external-scripts-loader.js	2.35 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	8.36 kB
dist/web-vitals.js	10.3 kB

_{compressed-size-action}

[mariusandra]

Just in case, I'll wait for Monday before merging this

[alecmocatta]

@mariusandra Thanks for this PR! pinging in case you're best-placed to answer #1503