[qualys_gav]: Retention enabled by default and not configurable

### Integration Name

Qualys Global AssetView [qualys_gav]

### Dataset Name

qualys_gav.asset

### Integration Version

0.1.0

### Agent Version

9.1.0

### Agent Output Type

elasticsearch

### Elasticsearch Version

9.1.0

### OS Version and Architecture

elastic-package

### Software/API Version

2.0

### Error Message

No error message

### Event Original

N/A

### What did you do?

I configured the Qualys GAV application through the UI.

### What did you see?

I've seen than an ILM is configured on the `qualys_gav.asset` datastream. It doesn't seem to be configurable, nor we have the possibility to disable it.

### What did you expect to see?

I would expect those solutions, in this prefered order:
- ILM is configurable in the UI: enable/disable and possibility to select the retention period
- Configurable through a standalone yaml config file
- Disabled by default if not configurable
- Removed

### Anything else?

One of the reason we asked to have the Qualys Global AssetView elastic agent integration is the possibility to build trends. If an ILM is configured with a 30 days retention, we loose the interest.