[ENG-513] update-webhook filterTypes

[ktanishqk]

Summary by cubic

Enable updating a webhook’s subscribed event types via PATCH /webhooks/{webhook_id} using event_types. Non-empty arrays replace the full list; omit or [] leaves it unchanged. Addresses ENG-513.

• New Features
  • Added event_types? to webhooks.update request. Non-empty replaces all types; omit or [] keeps current; clearing all is not supported. Permissions required for message.received.spam, message.received.blocked, and message.received.unauthenticated.
  • Improved docs: clarified create/update behavior, added an “Updating event_types” section, and updated API snippets to include event_types on update.

^{Written for commit a7216c3. Summary will update on new commits.}

[github-actions]

✨ API Changes

# API Changelog n/a vs. n/a


## API Changes

### PATCH /v0/webhooks/{webhook_id}
-  added the new optional request property `event_types`

💡 Download api-changelog-diff artifact or tag @fern Writer in #github-prs for changelog.

[github-actions]

🌿 Preview your docs: https://agentmail-preview-ca0a0562-bee6-45cb-929a-2cac46745c77.docs.buildwithfern.com

[cubic-dev-ai]

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