… ignore unknown properties in responses

### Summary

This PR updates the Gemini connector's `RunApiResponseSchema` to ignore unknown properties in responses.

It fixes an issue where the recent addition of a `modelVersion` in Gemini responses causes Attack discovery to fail with the following error:

```
Attack discovery generation failed

ActionsClientLlm: action result status is error: an error occurred while running the action - Response validation failed (Error: [modelVersion]: definition for this key is missing)
```

shown in the screenshot below:

![error](https://github.com/user-attachments/assets/8b706290-27ca-42d9-b972-3d8613af690c)

### Desk testing

To reproduce:

1) Navigate to Security > Attack discovery

2) Select a Gemini connector

3) Click Generate

**Expected result**

- Attack discoveries are generated

**Actual result**

- The following error is displayed:

```
Attack discovery generation failed

ActionsClientLlm: action result status is error: an error occurred while running the action - Response validation failed (Error: [modelVersion]: definition for this key is missing)
```

![error](https://github.com/user-attachments/assets/8b706290-27ca-42d9-b972-3d8613af690c)