🐛 fix bundle size increase threshold never triggering (#4852)

Author: rgaignault

scripts/bundle-size/lib/bundleSizes.ts

@@ -6,7 +6,7 @@ import { fetchPerformanceMetrics } from './fetchPerformanceMetrics.ts'
 import { markdownArray, type Pr } from './reportAsAPrComment.ts'
 
 // The value is set to 5% as it's around 10 times the average value for small PRs.
-const SIZE_INCREASE_THRESHOLD = 5
+const SIZE_INCREASE_THRESHOLD = 0.05
 
 export async function computeAndReportBundleSizes(pr?: Pr) {
   const localBundleSizes = extractUncompressedBundleSizes(calculateBundleSizes())
@@ -84,7 +84,7 @@ export function formatBundleSizes({
   })
 
   if (highIncreaseDetected) {
-    message += `\n⚠️ The increase is particularly high and exceeds ${SIZE_INCREASE_THRESHOLD}%. Please check the changes.`
+    message += `\n⚠️ The increase is particularly high and exceeds ${formatPercentage(SIZE_INCREASE_THRESHOLD)}. Please check the changes.`
   }
 
   return message