Enable the sort-keys eslint rule (#1746)

## Description:

Enable the `sort-keys` eslint rule.

Fixes #1629

## 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
- [ ] I have read and accepted the CLA agreement (only required once).

src/core/CustomFlag.ts

@@ -2,12 +2,14 @@ import { Cosmetics } from "./CosmeticSchemas";
 
 const ANIMATION_DURATIONS: Record<string, number> = {
   rainbow: 4000,
+  /* eslint-disable sort-keys */
   "bright-rainbow": 4000,
   "copper-glow": 3000,
   "silver-glow": 3000,
   "gold-glow": 3000,
   neon: 3000,
   lava: 6000,
+  /* eslint-enable sort-keys */
   water: 6200,
 };
 
@@ -28,6 +30,7 @@ export function renderPlayerFlag(
   const code = flag.slice("!".length);
   const layers = code.split("_").map((segment) => {
     const [layerKey, colorKey] = segment.split("-");
+    // eslint-disable-next-line sort-keys
     return { layerKey, colorKey };
   });