Makes a borg rapid construction-type tools unit test (#94864)

## About The Pull Request

Makes a unit test that checks the engineering borg's RCD & RTD to make
sure they're working.

## Why It's Good For The Game

After the issue that happened a little bit ago where these stopped
working, a unit test was suggested. This test would have prevented that
issue, and also serves as a general rcd and rtd test to some extent.

code/modules/unit_tests/borg_tools.dm

@@ -0,0 +1,37 @@
+/datum/unit_test/borg_tools
+	priority = TEST_LONGER
+	var/oldturftype
+	var/turf/targetturf
+
+/datum/unit_test/borg_tools/Run()
+	var/mob/living/silicon/robot/ourborg = EASY_ALLOCATE()
+	ourborg.model.transform_to(/obj/item/robot_model/engineering, TRUE, FALSE)
+	targetturf = locate(ourborg.x + 1, ourborg.y, ourborg.z)
+	oldturftype = targetturf.type
+	var/obj/item/construction/rtd/borg/rtd = locate(/obj/item/construction/rtd/borg) in ourborg.model
+	TEST_ASSERT_NOTNULL(rtd, "Engineering borg lacks an RTD module")
+	targetturf.ChangeTurf(/turf/open/floor/plating)
+	ourborg.activate_module(rtd)
+	ourborg.select_module(1)
+	TEST_ASSERT_NOTNULL(ourborg.module_active, "RTD module failed to activate")
+	click_wrapper(ourborg, targetturf)
+	rtd.selected_design.cost = 0.01
+	sleep(0.02 SECONDS)
+	TEST_ASSERT(!isplatingturf(targetturf), "Borg RTD was unable to place floor tiling")
+	ourborg.deactivate_module(rtd)
+
+	var/obj/item/construction/rcd/borg/rcd = locate(/obj/item/construction/rcd/borg) in ourborg.model
+	TEST_ASSERT_NOTNULL(rcd, "Engineering borg lacks an RCD module")
+	rcd.delay_mod = 0.01
+	ourborg.activate_module(rcd)
+	ourborg.select_module(1)
+	TEST_ASSERT_NOTNULL(ourborg.module_active, "RCD module failed to activate")
+	click_wrapper(ourborg, targetturf)
+	sleep(0.02 SECONDS)
+	TEST_ASSERT(iswallturf(targetturf), "Borg RCD was unable to create wall")
+	ourborg.deactivate_module(rcd)
+
+/datum/unit_test/borg_tools/Destroy()
+	targetturf.ChangeTurf(oldturftype)
+	return ..()
+