remove subdomains from domain telemetry

[converge]

As a Kubefirst user I want to provide less domain data to collected telemetry.

Today we only collect subdomain + domain, and Kubefirst version. To have the ability to count how many installations we have in a time frame, and not expose any user data, we want to collect the domain only, and remove the subdomain from the telemetry data.

AC1: user has the ability to not provide any telemetry data by using the skip telemetry flag
AC2: subdmains are removed from the telemetry, and only domain is used
AC3: there is a unit test to ensure the expected behaviour is properly implemented