fix: specify unique operationId for get collection (webhook) endpoint (#2057)

This PR fix OpenAPI docs rendering where due to non-unique `operationId`
it shows wrong endpoing documentation for "webhook dispatches" section.
Please check attached screenshots for more info.

Also, as positive side effect it should be the last blocker for
generating (Go and other languages) clients from our `openapi.yaml`
spec.

Close: #2000 

<img width="1912" height="1237" alt="Screenshot 2025-10-31 at 14 35 45"
src="https://github.com/user-attachments/assets/e25edc23-dc46-4526-8006-92e620861e38"
/>
<img width="1912" height="1237" alt="Screenshot 2025-10-31 at 14 43 07"
src="https://github.com/user-attachments/assets/04e78501-f9fc-4127-b5bd-bedb1d3c45f3"
/>

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Renames the OpenAPI operationId for GET webhook dispatches to a unique
identifier.
> 
> - **OpenAPI**:
> - Update `operationId` for `GET` `webhooks/{webhookId}/dispatches` in
`apify-api/openapi/paths/webhooks/webhooks@{webhookId}@dispatches.yaml`
from `webhook_dispatches_get` to `webhook_webhookDispatches_get`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
e00951c. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: bliuchak

apify-api/openapi/paths/webhooks/webhooks@{webhookId}@dispatches.yaml

@@ -3,7 +3,7 @@ get:
     - Webhooks/Webhooks
   summary: Get collection
   description: Gets a given webhook's list of dispatches.
-  operationId: webhook_dispatches_get
+  operationId: webhook_webhookDispatches_get
   parameters:
     - name: webhookId
       in: path