Add more encryption properties to PostHog (#12415)

* report time to decrypt an event if it's slow

* add more stats

* fix some tests

* keep original timestamp, and report non-visible decryption failures

* add statistic for whether the user trusts their own device

* revert local playwright docker changes

* apply changes from review

* also remove logout event handler on logout

* apply changes from review

* make eventDecrypted callback private

src/components/structures/MatrixChat.tsx

@@ -21,7 +21,6 @@ import {
     EventType,
     HttpApiEvent,
     MatrixClient,
-    MatrixEventEvent,
     MatrixEvent,
     RoomType,
     SyncStateData,
@@ -1592,11 +1591,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         // tracked events across sessions.
         // dft.loadTrackedEventHashMap();
 
-        dft.start();
-
-        // When logging out, stop tracking failures and destroy state
-        cli.on(HttpApiEvent.SessionLoggedOut, () => dft.stop());
-        cli.on(MatrixEventEvent.Decrypted, (e) => dft.eventDecrypted(e));
+        dft.start(cli);
 
         cli.on(ClientEvent.Room, (room) => {
             if (cli.isCryptoEnabled()) {