fix: async validation errors

[aspicer]

Problem

Async user surfaceable queries don't have user friendly errors https://github.com/PostHog/posthog/issues/21270

Changes

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

Tested locally

[github-actions[bot]]

Size Change: +172 B (+0.02%)

Total Size: 1.05 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.05 MB	+172 B (+0.02%)

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