Extend Tab Groups-related flags

Not extending Feedback due to crbug.com/1071685, which should get rid of the flag by M87.

Bug: 1121490
Change-Id: I5fee2753a77303a5dd35ed555afcb85ef8d91943
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2375485
Commit-Queue: Connie Wan <connily@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801400}

chrome/browser/flag-metadata.json

@@ -4235,18 +4235,18 @@
   },
   {
     "name": "tab-groups",
-    "owners": [ "chrome-desktop-ui-seattle@google.com", "bsep" ],
-    "expiry_milestone": 86
+    "owners": [ "chrome-desktop-ui-seattle@google.com", "connily" ],
+    "expiry_milestone": 88
   },
   {
     "name": "tab-groups-collapse",
     "owners": [ "chrome-desktop-ui-seattle@google.com", "xialinyan" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 89
   },
   {
     "name": "tab-groups-collapse-freezing",
     "owners": [ "chrome-desktop-ui-seattle@google.com", "xialinyan" ],
-    "expiry_milestone": 87
+    "expiry_milestone": 89
   },
   {
     "name": "tab-groups-feedback",