[Bug] MAC Addresses Using `:` Separators Instead of `-`

While working on an Integration for Elastic Agent, I noticed there are some discrepancies between the use of `:` or `-` separators for MAC addresses throughout some Elastic products. According to [ECS Host Fields](https://www.elastic.co/guide/en/ecs/current/ecs-host.html#field-host-mac), the standard should be `-`, but as of 8.6.2, Elastic Endpoint is still using `:` separators for MAC addresses.