fix(3742): add readbility to large number and fix the logic to remove 4 in uuidv4 properly

Author: DDDDDanica

packages/remote-feature-flag-controller/src/utils/user-segmentation-utils.ts

@@ -31,7 +31,7 @@ export function generateDeterministicRandomNumber(
   let cleanId: string, value: bigint;
   // uuidv4 format
   if (uuidValidate(metaMetricsId) && uuidVersion(metaMetricsId) === 4) {
-    cleanId = metaMetricsId.replace(/^(.{12})4/u, '$1f').replace(/-/gu, '');
+    cleanId = metaMetricsId.replace(/-/gu, '').replace(/^(.{12})4/u, '$1f');
     value = BigInt(`0x${cleanId}`);
   } else {
     // hex format with 0x prefix
@@ -40,7 +40,7 @@ export function generateDeterministicRandomNumber(
   }
   const maxValue = BigInt(`0x${'f'.repeat(cleanId.length)}`);
   // Use BigInt division first, then convert to number to maintain precision
-  return Number((value * BigInt(1000000)) / maxValue) / 1000000;
+  return Number((value * BigInt(1_000_000)) / maxValue) / 1_000_000;
 }
 
 /**