Fix runtime when deleting crossbows/syringe guns (#60421)

code/modules/unit_tests/_unit_tests.dm

@@ -52,6 +52,7 @@
 #include "connect_loc.dm"
 #include "confusion.dm"
 #include "crayons.dm"
+#include "deletions.dm"
 #include "designs.dm"
 #include "dynamic_ruleset_sanity.dm"
 #include "egg_glands.dm"

code/modules/unit_tests/deletions.dm

@@ -0,0 +1,7 @@
+/// This is for regression tests of deletions that used to runtime.
+/// This would ideally be replaced by Del The World, unit testing every single deletion.
+/datum/unit_test/deletion_regressions
+
+/datum/unit_test/deletion_regressions/Run()
+	qdel(new /obj/item/gun/energy/kinetic_accelerator/crossbow)
+	qdel(new /obj/item/gun/syringe/syndicate)