blackbox: Record biohazard pop at intervals. (#26930)

* blackbox: Record biohazard pop at intervals.

* associative fine here

* don't use recursive timer callbacks

code/modules/events/alien_infestation.dm

@@ -41,4 +41,5 @@
 
 			spawncount--
 			successSpawn = TRUE
-	SSevents.biohazards_this_round += "Xenomorphs"
+	SSticker.record_biohazard_start(BIOHAZARD_XENO)
+	SSevents.biohazards_this_round += BIOHAZARD_XENO

code/modules/events/blob_spawn.dm

@@ -39,4 +39,4 @@
 	to_chat(B, "<span class='motd'>For more information, check the wiki page: ([GLOB.configuration.url.wiki_url]/index.php/Blob)</span>")
 	notify_ghosts("Infected Mouse has appeared in [get_area(B)].", source = B, action = NOTIFY_FOLLOW)
 	successSpawn = TRUE
-	SSevents.biohazards_this_round += "Blob"
+	SSevents.biohazards_this_round += BIOHAZARD_BLOB

code/modules/events/spider_terror.dm

@@ -66,6 +66,7 @@
 		S.give_intro_text()
 		spawncount--
 		successSpawn = TRUE
+	SSticker.record_biohazard_start(infestation_type)
 	SSevents.biohazards_this_round += infestation_type
 
 #undef TS_HIGHPOP_TRIGGER