Refactor: Remove Webhook Service, use underlying services directly

[lkostrowski]

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• [ ] I added changesets and read good practices.

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🦋 Changeset detected

Latest commit: edd70f8a2559b53128477fb59a7ade5a4fb6287d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------- | ----- | | app-avatax | Patch |

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