feat(platform, blocks): Webhook-triggered blocks (#8358)

- feat(blocks): Add GitHub Pull Request Trigger block

## feat(platform): Add support for Webhook-triggered blocks
- ⚠️ Add `PLATFORM_BASE_URL` setting

- Add webhook config option and `BlockType.WEBHOOK` to `Block`
  - Add check to `Block.__init__` to enforce type and shape of webhook event filter
  - Add check to `Block.__init__` to enforce `payload` input on webhook blocks
  - Add check to `Block.__init__` to disable webhook blocks if `PLATFORM_BASE_URL` is not set

- Add `Webhook` model + CRUD functions in `backend.data.integrations` to represent webhooks created by our system
  - Add `IntegrationWebhook` to DB schema + reference `AgentGraphNode.webhook_id`
    - Add `set_node_webhook(..)` in `backend.data.graph`

- Add webhook-related endpoints:
  - `POST /integrations/{provider}/webhooks/{webhook_id}/ingress` endpoint, to receive webhook payloads, and for all associated nodes create graph executions
    - Add `Node.is_triggered_by_event_type(..)` helper method
  - `POST /integrations/{provider}/webhooks/{webhook_id}/ping` endpoint, to allow testing a webhook
  - Add `WebhookEvent` + pub/sub functions in `backend.data.integrations`

- Add `backend.integrations.webhooks` module, including:
  - `graph_lifecycle_hooks`, e.g. `on_graph_activate(..)`, to handle corresponding webhook creation etc.
    - Add calls to these hooks in the graph create/update endpoints
  - `BaseWebhooksManager` + `GithubWebhooksManager` to handle creating + registering, removing + deregistering, and retrieving existing webhooks, and validating incoming payloads

## Other improvements
- fix(blocks): Allow having an input and output pin with the same name
- fix(blocks): Add tooltip with description in places where block inputs are rendered without `NodeHandle`
- feat(blocks): Allow hiding inputs (e.g. `payload`) with `SchemaField(hidden=True)`
- fix(frontend): Fix `MultiSelector` component styling
- feat(frontend): Add `AlertDialog` UI component
- feat(frontend): Add `NodeMultiSelectInput` component
- feat(backend/data): Add `NodeModel` with `graph_id`, `graph_version`; `GraphModel` with `user_id`
  - Add `make_graph_model(..)` helper function in `backend.data.graph`
- refactor(backend/data): Make `RedisEventQueue` generic and move to `backend.data.execution`
- refactor(frontend): Deduplicate & clean up code for different block types in `generateInputHandles(..)` in `CustomNode`
- dx(backend): Add `MissingConfigError`, `NeedConfirmation` exception

---------

Co-authored-by: Zamil Majdy <zamil.majdy@agpt.co>

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