Converts some notify_ghosts args to bitflags, multilines all notify_ghosts calls (#79320)

## About The Pull Request

This helps clean up my favorite helper proc in the whole codebase,
`notify_ghosts()`.

The notify_suiciders, ignore_mapload, and flashwindow args are GONE.
They have been replaced with the notify_flags bitflag argument. This was
intended to make deadchat announcements a bitflag argument too, but
those got reverted right before I originally wanted to submit this PR.

The on-screen popup now shows the notification body when you hover it
with your mouse again. The format is now `[notify_ghosts message] --
[click action (orbit/jump/play)]`

Every single `notify_ghosts()` call has been changed to multiline format
and has been given trailing commas. Pretty!
## Why It's Good For The Game

Cleans up a proc that is very popular and going through a lot of changes
at the time.

Allows for further flexibility when this proc inevitably gets tweaked or
improved. 12 -> 10 args is an improvement, and it doesn't impact the
helper's flexibility at all.
## Changelog
🆑 Rhials
code: The notify_ghosts proc has been cleaned up. Please report any
abnormal changes in deadchat notification behavior.
qol: The on-screen deadchat popups now contain the notification blurb
when hovered with your mouse again.
/🆑

code/modules/mapfluff/ruins/objects_and_mobs/necropolis_gate.dm

@@ -190,7 +190,12 @@ GLOBAL_DATUM(necropolis_gate, /obj/structure/necropolis_gate/legion_gate)
 				M.playsound_local(T, null, 100, FALSE, 0, FALSE, pressure_affected = FALSE, sound_to_use = legion_sound)
 				flash_color(M, flash_color = "#FF0000", flash_time = 50)
 		var/mutable_appearance/release_overlay = mutable_appearance('icons/effects/effects.dmi', "legiondoor")
-		notify_ghosts("Legion has been released in the [get_area(src)]!", source = src, alert_overlay = release_overlay, action = NOTIFY_JUMP, flashwindow = FALSE)
+		notify_ghosts(
+			"Legion has been released in the [get_area(src)]!",
+			source = src,
+			alert_overlay = release_overlay,
+			notify_flags = NOTIFY_CATEGORY_NOFLASH,
+		)
 
 /obj/effect/decal/necropolis_gate_decal
 	icon = 'icons/effects/96x96.dmi'