[Website]: VMware vSphere Integration does not indicate minimum necessary permissions for account used to gather metrics

### Before you submit

- [x] This issue is about a documentation page, flow, or piece of content.

### Type of issue

Missing information

### What documentation page or section is affected

https://www.elastic.co/docs/reference/integrations/vsphere

### What happened?

When configuring the VMware vSphere Integration to "Collect vSphere metrics", a service account username/password is requested by the integration. However, the documentation does not indicate the minimum necessary permission levels and on which vSphere objects it needs permissions. For security reasons, I want to limit the account to only the exact granular permissions the account requires in vCenter for the integration to operate and no more than that.

Does it need full Read Only permissions on All Objects, can the granted permissions be less than that, does it need an Admin account, etc.?

### Additional info

_No response_