[TC][Feature] [Core] Allow to create arena teams and join rated with bots

[DEV7163]

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Description

Hey, I noticed in another issue that you seemed unsure about this, but since it's optional, I don't see any drawbacks. Would you mind considering it? Thanks!

TrinityCore or AzerothCore

TrinityCore

Core rev. hash/commit

No response

Operating system

No response

[Shadowcoldzx]

Would be nice to get it running, with full npcbot teams as well.

I was also extremely drunk so for those who saw the previous comment, "would be nice" is all it was.