Fixes bubblegum suicide span, cleans up say spans (#96103)

## About The Pull Request

Closes #96085
Also went through other say spans and converted them to defines, as well
as fixed beepsky smash's hallucination beepskys not having their spans
due to incorrect span being passed.

## Changelog
🆑
fix: Bubblegun suicide no longer makes the user yell out HTML
fix: Beepsky Smash beepskys now use proper text formatting
code: Cleaned up say span code in a few places
/🆑

code/datums/actions/mobs/projectileattack.dm

@@ -331,7 +331,7 @@
 	var/mob/living/simple_animal/hostile/megafauna/colossus/colossus
 	if(istype(firer, /mob/living/simple_animal/hostile/megafauna/colossus))
 		colossus = firer
-		colossus.say("Perish.", spans = list("colossus", "yell"))
+		colossus.say("Perish.", spans = list(SPAN_COLOSSUS, SPAN_YELL))
 
 	SLEEP_CHECK_DEATH(1.5 SECONDS, firer) //gives dumbasses in melee range a slim chance to retreat
 	var/finale_counter = 10

code/datums/brain_damage/special.dm

@@ -439,7 +439,7 @@
 		var/beepskys_cry = "Level 10 infraction alert!"
 		to_chat(victim, "[span_name("[name]")] exclaims, \"[span_robot("[beepskys_cry]")]")
 		if(victim.client?.prefs.read_preference(/datum/preference/toggle/enable_runechat))
-			victim.create_chat_message(src, raw_message = beepskys_cry, spans = list("robotic"))
+			victim.create_chat_message(src, raw_message = beepskys_cry, spans = list(SPAN_ROBOT))
 
 // Used by Veteran Security Advisor job.
 /datum/brain_trauma/special/ptsd