Add labs flag: Show only current profile on historical messages (#7815)

* Add labs flag: Show only current profile on historical messages

For https://github.com/vector-im/element-web/issues/3768
Related https://github.com/vector-im/element-web/issues/4677

* Use the member's user ID

src/settings/Settings.tsx

@@ -307,6 +307,13 @@ export const SETTINGS: {[setting: string]: ISetting} = {
         displayName: _td("Show extensible event representation of events"),
         default: false,
     },
+    "feature_use_only_current_profiles": {
+        isFeature: true,
+        labsGroup: LabGroup.Rooms,
+        supportedLevels: LEVELS_FEATURE,
+        displayName: _td("Show current avatar and name for users in message history"),
+        default: false,
+    },
     "doNotDisturb": {
         supportedLevels: [SettingLevel.DEVICE],
         default: false,