fix: v2.4.1 NGO TestHelpers update

[NoelStephensUnity]

Description

Since NGO v2.4.1 and above will now house testhelpers within the runtime tests assembly, we need to add the Unity.Netcode.Runtime.Tests to the BossRoom's tests asmdef.

Issue Number(s)

NA

Contribution checklist

• Tests have been added for boss room and/or utilities pack
• Release notes have been added to the project changelog file and/or package changelog file
• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• JIRA ticket ID is in the PR title or at least one commit message
• Include the ticket ID number within the body message of the PR to create a hyperlink
• An Index entry has been added in readme.md if applicable

[unity-cla-assistant]

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1 out of 2 committers have signed the CLA.

✅ fernando-cortez
❌ NoelStephensUnity
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[fernando-cortez]

We just need to add a line to our changelog.
Thanks Noel, this looks great.