Adds a visual indicator to the Transfer Plasma ability (#5862)

# About the pull request

Adds this visual indicator to the Transfer Plasma ability:

<details>
<summary>Transfer Plasma</summary>


https://github.com/cmss13-devs/cmss13/assets/49321394/80a346c3-eb1b-4652-8d17-0f96c6d519df

</details>

# Explain why it's good for the game

1. It might make dumb idiot Hivelords and Queens stop running away from
drones who try to feed them plasma.
2. There was only a generic xeno audio and a chat cue that the recipient
should be standing still for two (2) seconds, both that are too easy to
miss.
3. Visuals-wise, it makes it a bit more inline with the Transfer
Health/Give Plasma abilities, without changing its functionality.
4. Marines can now see if someone is getting remotely plasma buffed (via
Hivelords)

# Testing Photographs and Procedure

See above.

# Changelog

:cl:
qol: The Transfer Plasma ability now has a blue, healing overlay and
causes a second-long jitter upon success, to show the recipient that
they are being targeted.
/:cl:

code/modules/mob/living/carbon/xenomorph/abilities/ability_helper_procs.dm

@@ -310,6 +310,9 @@
 
 	to_chat(src, SPAN_NOTICE("We start focusing our plasma towards [target]."))
 	to_chat(target, SPAN_NOTICE("We feel that [src] starts transferring some of their plasma to us."))
+	face_atom(target)
+	target.flick_heal_overlay(transfer_delay, COLOR_CYAN)
+
 	if(!do_after(src, transfer_delay, INTERRUPT_ALL, BUSY_ICON_FRIENDLY))
 		return
 
@@ -320,6 +323,7 @@
 		amount = plasma_stored //Just use all of it
 	use_plasma(amount)
 	target.gain_plasma(amount)
+	target.xeno_jitter(1 SECONDS)
 	to_chat(target, SPAN_XENOWARNING("[src] has transfered [amount] plasma to us. We now have [target.plasma_stored]."))
 	to_chat(src, SPAN_XENOWARNING("We have transferred [amount] plasma to [target]. We now have [plasma_stored]."))
 	playsound(src, "alien_drool", 25)