fix: include all supported fields for ad-hoc webhooks (#855)

This PR updates the auto-generated Pydantic models and TypedDicts based
on OpenAPI specification changes in [apify-docs PR
#2640](https://github.com/apify/apify-docs/pull/2640).

On top of the regenerated models, it fixes a related bug: ad-hoc
webhooks passed to `start()` / `call()` silently dropped
`idempotency_key`, `ignore_ssl_errors` and `do_not_retry`.
`WebhookRepresentation` declared only the four templating fields, and
`encode_webhooks_to_base64` keeps only declared fields, so these three
never reached the platform. The platform accepts and honors all three
for ad-hoc webhooks (verified in apify-core: the run-start handler feeds
them into the same webhook-creation path as the create-webhook endpoint,
including the `idempotencyKey` dedup).

What changed:

- The regenerated models add the three fields to `WebhookRepresentation`
and both webhook-representation typed dicts (snake_case + camelCase).
- Reworks the `WebhookCreate` / dict projection in
`encode_webhooks_to_base64` to filter by the fields
`WebhookRepresentation` declares, instead of hand-listing them. New
ad-hoc fields now flow through automatically, so this class of
silent-drop bug cannot recur.

Unblocks apify/apify-sdk-python#963, which forwards these fields from
the SDK `Webhook` dataclass.

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Co-authored-by: Vlada Dusek <v.dusek96@gmail.com>