Extend the feature flag expiry for the default Chrome app to web app …

…migration

This migration effort is still underway, these flags will be removed
once migration is completely done.

Bug: 1058265, 809304
Change-Id: I5d67b96a02c4b7ebe9b7a45761557484c15307be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3149803
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/main@{#919719}

chrome/browser/flag-metadata.json

@@ -2262,12 +2262,12 @@
   {
     "name": "enable-migrate-default-chrome-app-to-web-apps-gsuite",
     "owners": [ "alancutter", "desktop-pwas-team@google.com" ],
-    "expiry_milestone": 94
+    "expiry_milestone": 100
   },
   {
     "name": "enable-migrate-default-chrome-app-to-web-apps-non-gsuite",
     "owners": [ "alancutter", "desktop-pwas-team@google.com" ],
-    "expiry_milestone": 94
+    "expiry_milestone": 100
   },
   {
     "name": "enable-nacl",