remove entity:utils/damage check for boss fight

[TheAfroOfDoom]

while attacks are still being developed and validated, we have an execute unless entity @e[tag=boss_fight] ... check since the damage function can take in an from argument at the end to specify who did the damage (see wiki)

we'll want to specify that the boss_fight entity did the damage so that when someone dies it says

TheAfroOfDoom was killed by Omega Flowey

problem is we also want to be able to run attacks individually (not restricted to running them only during the boss fight) while developing them (e.g. function _:attack/homing-vines). so we split the damage command into two versions:

• one that makes the boss_fight entity the cause of damage if it exists
• one that has no source of damage if the boss_fight doesn't exist

https://github.com/TheAfroOfDoom/omega-flowey-minecraft-remastered/blob/afb1cc943424e4145c365b8503f9b30655effa6f/datapacks/omega-flowey/data/entity/functions/utils/damage.mcfunction#L1-L6

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this split will be an unnecessary check once all attacks are completed and the boss fight runs in entirety, so we should remove this check then and convert the function to the single line:

$execute as @a[distance=..$(radius),team=player] run damage @s $(damage) minecraft:mob_projectile by @e[tag=boss_fight,limit=1]

[TheAfroOfDoom]

this could instead be part of a larger refactor to use a global storage to store the boss fight entity's UUID for reference.

execute if entity $(boss_fight_uuid) run ...