chore(experiments HogQL): render main goal from HogQL

[jurajmajerik]

Changes

Feature flag: experiments-hogql

Render results for the main experiment goal using the HogQL query.

Used a few type casts to satisfy the compiler. Will clean up and re-type properly once the flag is removed.

Old query	HogQL query

How did you test this code?

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[github-actions]

Size Change: +38 B (0%)

Total Size: 1.15 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.15 MB	+38 B (0%)

_{compressed-size-action}

[posthog-bot]

📸 UI snapshots have been updated

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• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

• chromium: 0 added, 1 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.

[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

• chromium: 0 added, 1 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

Triggered by this commit.

👉 Review this PR's diff of snapshots.