Reminder: Add double battle weather form change test

[AsparagusEduardo]

Description

#4382 fixed the issue seen here: https://www.twitch.tv/barron/clip/TameEnticingCoffeeFailFish-no2A-uR5rfNDy_Zx

However, to avoid a regression, I recommend that we add a test that replicates this issue.
Details by @skolgrahd:

if battler 1 was Cloud Nine Golduck and battler 2 was Flower Gift Cherrim, no soft lock. But move Golduck to battler 0 and you had a soft lock

Might also be worth investigating why the position of the battler was producing different results.

Version

1.8.1 (Latest release)

Upcoming/master Version

No response

Discord contact info

AsparagusEduardo