feat: Action webhooks part 2

[benjackwhite]

Problem

See https://github.com/PostHog/posthog/issues/21721

This PR attempts to do Plan B of https://github.com/PostHog/product-internal/issues/599

Changes

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

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

How did you test this code?

[benjackwhite]

@tiina303 this would be the follow up to the action matching PR.

(There is another PR mixed in here so its a bit unpure but the key code changes are here https://github.com/PostHog/posthog/pull/22066/files#diff-1b8472934c778571069622f041eaeac4bd00fdd66f38c98048570497b8836a8a

Would be interested on your opinion on this approach.

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.05 MB

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frontend/dist/toolbar.js	1.05 MB

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