A timer and icon flashing for betryal debuff (#2430)

Resolves #2096 

## Description:

(TO CLEARIFY THEIRS NO GRACE PERIOD ADDED, AS THAT ISSUE THAT WOULD OF
NEEDED IT WAS FIXED BEFORE ON ITS OWN)

Shows the amount left in the UI for the player who trigged it
<img width="374" height="80" alt="image"
src="https://github.com/user-attachments/assets/f269c015-5a78-4e85-a9c0-cdf039d93d2a"
/>

also the betryal icon, after 15 seconds starts a slow flash, then after
10 seconds it speeds up, and then at 5 seconds it quickly flashs.

this was a nice way to show the time left without adding any new ui
componets.


video link 36 seconds (https://streamable.com/cwzxch)

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

notifxy (1379678982676676639)

resources/lang/en.json

@@ -580,7 +580,8 @@
     "alliance_renewed": "Your alliance with {name} has been renewed",
     "wants_to_renew_alliance": "{name} wants to renew your alliance",
     "ignore": "Ignore",
-    "unit_voluntarily_deleted": "Unit voluntarily deleted"
+    "unit_voluntarily_deleted": "Unit voluntarily deleted",
+    "betrayal_debuff_ends": "{time} seconds left until betrayal debuff ends"
   },
   "unit_info_modal": {
     "structure_info": "Structure Info",