Some images are not available on the Collect Logstash monitoring data for dashboards page

#### Tell us about the issue
**Description:**
Broken images on Collect Logstash monitoring data for dashboards page

**URL:**
https://www.elastic.co/guide/en/logstash/current/dashboard-monitoring-with-elastic-agent.html

**Anything else?**
It looks like some images were not uploaded successfully. For example, in the same commit (c060c00d7c38fd91d3e6ed3a3e2ffdc74423d984), kibana-home.png and integration-agent-confirm.png were created, but only the former [is available](https://www.elastic.co/guide/en/logstash/current/images/kibana-home.png).

Open the dashboard-monitoring-with-elastic-agent.html page and inspect the image references, then compare them with commit c060c00d7c38fd91d3e6ed3a3e2ffdc74423d984. Check the availability of integration-agent-confirm.png alongside kibana-home.png. Done means the reported images are uploaded and render on the published documentation page.

Written by the indexing model from the issue text.