[MIRROR] Calls Allocate on the spawn humans unit test humans [MDB IGNORE] (#25128)

* Calls Allocate on the spawn humans unit test humans (#79827)

## About The Pull Request

I have found a unit test that spawn instances of
`/mob/living/carbon/human/consistent`, without using `allocate`, so they
won't get into the list of things to be deleted when CI finishes
running. This PR ensures that they won't stick around after the unit
test has finished.

I kept them picking a random tile from the unit test room, instead of
going with `allocate`'s default of the test area's bottom left corner.
Could have maybe swapped it to pick_n_take so there is no chance of them
piling up, but that is not relevant to the CI issue.

## Why It's Good For The Game

Maybe this will stop the random CI failures where
`/mob/living/carbon/human/consistent` fails to be deleted.

## Changelog

Nothing player facing

* Calls Allocate on the spawn humans unit test humans

---------

Co-authored-by: Profakos <profakos@gmail.com>

code/modules/unit_tests/spawn_humans.dm

@@ -2,7 +2,7 @@
 	var/locs = block(run_loc_floor_bottom_left, run_loc_floor_top_right)
 
 	for(var/I in 1 to 5)
-		new /mob/living/carbon/human/consistent(pick(locs))
+		allocate(/mob/living/carbon/human/consistent, pick(locs))
 
 	sleep(5 SECONDS)