fix: add clarification to endpoint unit tests

[leonardocaylent]

Description

Based on the conversation during #4296 this is an addition to clarify that A records cannot live with CNAME records with the same hostnames. Since the function that was developed is not expected to validate the type of records, this unit test was splitted into 2 different Record types to avoid any type of possible confusion in the future.

Fixes #4339

Checklist

• [x] Unit tests updated
• [ ] End user documentation updated

[k8s-ci-robot]

Hi @leonardocaylent. Thanks for your PR.

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[leonardocaylent]

This is ready to be tested and is just a complement of #4241

[mloiseleur]

/ok-to-test

[leonardocaylent]

This is ready to review

[mloiseleur]

/lgtm

[Raffo]

/approve

[k8s-ci-robot]

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