Lag War Day 2: TGUI performance improvements (#21848)

<img width="707" height="659" alt="image"
src="https://github.com/user-attachments/assets/6c8db0bf-dec6-40f2-86e8-120531fa5693"
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the traitor uplink is causing a genuine hostage situation to the server
by simply being open due to the frankly insane amount of data that it
builds and ships every single UI process tick (which is very often!!!)

i've never been ragebaited by a single .dm file before so hard in my
entire developer career so I simply neutered it into using static data
and hit the commit button. it might break, if it does we're burning it
to the ground and remaking it. genuinely heinous crimes going on there

In addition I'm porting:

* [Fix several SHOULD_NOT_SLEEP hits in SStgui.update_uis()
tgstation/tgstation#75411](https://github.com/tgstation/tgstation/pull/75411)
* [Moves ui references from the tgui subsystem to datums themselves
tgstation/tgstation#76215](https://github.com/tgstation/tgstation/pull/76215)
* [Fixes some spurious runtimes in SStgui procs
tgstation/tgstation#76251](https://github.com/tgstation/tgstation/pull/76251)
* [Fixes tgui_open_uis tracking
tgstation/tgstation#77101](https://github.com/tgstation/tgstation/pull/77101)

moving ui references to the datums themselves is a pretty nice
performance boost because otherwise we have to iterate across all open
uis every time a list input closes which sucks! the rest are just fixes
to that original PR.

thank you for your attention to this matter

code/modules/tgui/external.dm

@@ -70,7 +70,7 @@
  * change static data.
  */
 /datum/proc/update_static_data_for_all_viewers()
-	for (var/datum/tgui/window as anything in SStgui.open_uis_by_src[text_ref(src)])
+	for (var/datum/tgui/window as anything in open_uis)
 		window.send_full_update()
 
 /**