[imperva_cloud_waf]: unable to update agent policy

### Integration Name

Imperva Cloud WAF [imperva_cloud_waf]

### Dataset Name

_No response_

### Integration Version

1.11.3

### Agent Version

8.17.4

### Agent Output Type

elasticsearch

### Elasticsearch Version

v8.17.2

### OS Version and Architecture

RHEL

### Software/API Version

_No response_

### Error Message

Saved object [ingest-agent-policies/] not found

### Event Original

_No response_

### What did you do?

This error appears whenever any attempt to update the imperva_cloud_waf agent policy is made. To be specific, it has appeared when trying to update the API id and key, as well as when attempting to change which agents on which the integration is deployed.

The save fails, and the policy is not updated.

### What did you see?

We see the error message mentioned above:

Saved object [ingest-agent-policies/a4d374a7-f13c-4fd1-b3ce-e0436ccb02b4] not found

### What did you expect to see?

The policy should have been updated and pushed to the relevant agents.

### Anything else?

_No response_