The EIS for self-managed page likely applies to ECK/ECE too

### Type of issue

Inaccurate

### What documentation page is affected

https://www.elastic.co/docs/docs/explore-analyze/elastic-inference/connect-self-managed-cluster-to-eis

### What happened?

internally, we talk about "self-managed" as meaning ECK/ECE/vanilla, but in the docs, "self-managed" refers to a fully self-managed cluster (bare metal install). We make this distinction because users think about their specific deployment type, not "cloud" vs. "not cloud". This page should likely be edited so all instances of "self-managed" are replaced with all of the applicable deployment types, and the applicable deployment types are clearly spelled out in the prerequisites. you might also want to change the applies tags so the deployment types are featured, rather than the stack version, because that's the "more relevant" piece of info

also applies to https://www.elastic.co/docs/deploy-manage/cloud-connect#elastic-infer-cap-service-eis

see https://www.elastic.co/docs/deploy-manage/monitor/autoops/cc-connect-self-managed-to-autoops for an example of how we deal with deployment types / stack versions in the context of CCM in the autoops docs

### Additional info

_No response_