fix(experiments): Avoid overriding feature flag payloads

[danielbachhuber]

See https://posthog.slack.com/archives/C07Q2U4BH4L/p1734548216860989

Changes

Moves DistributionModal update logic to a standalone updateDistributionModal() method where we can wait to run updateExperiment() after the feature flags API call.

This PR reverts #26772, which introduced this problem. The underlying problem is that including parameters in the request will override any existing feature flag information that isn't present in the request.

Hope that this is an even less worse fix.

How did you test this code?

I reproduced the original issue and then verified this approach fixes it.

Original issue

CleanShot.2024-12-20.at.05.06.55.mp4

Fix applied

CleanShot.2024-12-20.at.05.05.20.mp4

[github-actions]

Size Change: 0 B

Total Size: 1.11 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.11 MB

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