Fix AI switching in absorbing mon incorrectly

[Pawkkie]

Description

The AI uses FindMonThatAbsorbsOpponentsMove to determine if it should switch in an absorber. This function isn't used when determining what mon to send in after a KO, so there are cases where they AI sends in a new mon, then immediately switch in a mon to try to absorb the incoming attack.

This doesn't sound like bad behaviour, except the AI isn't predicting the incoming attack, it is just referencing whatever attack the player used most recently. This data is no longer reliable if the AI has just sent out a new mon for the player to engage with, so this behaviour should be disabled if the AI just sent out a new mon.

Basically we need some method of checking whether the mon the AI is currently analyzing is the same mon that the player was attacking on the previous turn, as if it isn't we can't assume their moves anymore (without prediction).

This PR fixes this by tracking the AI's species across a turn, and evaluating if the battler at the start of turn X is the same species as the mon at the start of turn X - 1.

Tagging #5229 because this behaviour will need to be overridden if the AI is using AI_FLAG_MOVE_PREDICTION, but that flag doesn't exist yet, and this will remind me to do so when I eventually get to that feature request lol

Issue(s) that this PR fixes

Closes #6124

Discord contact info

@Pawkkie

[Pawkkie]

Fixed and undrafted lol

[AlexOn1ine]

that's a smart fix. I was going to suggest something like switchin sickness but this is a more general approach that can be applied elsewhere