Remove timeline explosion rageshake prompt

Concludes element-hq/element-web#8593

We are no longer seeing this error being triggered, and are considering it fixed. As a result, the dialog can be removed to reduce the amount of dead code in the project.

src/components/structures/MatrixChat.js

@@ -50,7 +50,6 @@ import SettingsStore, {SettingLevel} from "../../settings/SettingsStore";
 import { startAnyRegistrationFlow } from "../../Registration.js";
 import { messageForSyncError } from '../../utils/ErrorUtils';
 import ResizeNotifier from "../../utils/ResizeNotifier";
-import TimelineExplosionDialog from "../views/dialogs/TimelineExplosionDialog";
 
 const AutoDiscovery = Matrix.AutoDiscovery;
 
@@ -1307,17 +1306,6 @@ export default React.createClass({
             return self._loggedInView.child.canResetTimelineInRoom(roomId);
         });
 
-        cli.on('sync.unexpectedError', function(err) {
-            if (err.message && err.message.includes("live timeline ") && err.message.includes(" is no longer live ")) {
-                console.error("Caught timeline explosion - trying to ask user for more information");
-                if (Modal.hasDialogs()) {
-                    console.warn("User has another dialog open - skipping prompt");
-                    return;
-                }
-                Modal.createTrackedDialog('Timeline exploded', '', TimelineExplosionDialog, {});
-            }
-        });
-
         cli.on('sync', function(state, prevState, data) {
             // LifecycleStore and others cannot directly subscribe to matrix client for
             // events because flux only allows store state changes during flux dispatches.

src/i18n/strings/en_EN.json

@@ -1210,10 +1210,6 @@
     "Missing session data": "Missing session data",
     "Some session data, including encrypted message keys, is missing. Sign out and sign in to fix this, restoring keys from backup.": "Some session data, including encrypted message keys, is missing. Sign out and sign in to fix this, restoring keys from backup.",
     "Your browser likely removed this data when running low on disk space.": "Your browser likely removed this data when running low on disk space.",
-    "Error showing you your room": "Error showing you your room",
-    "Riot has run into a problem which makes it difficult to show you your messages right now. Nothing has been lost and reloading the app should fix this for you. In order to assist us in troubleshooting the problem, we'd like to take a look at your debug logs. You do not need to send your logs unless you want to, but we would really appreciate it if you did. We'd also like to apologize for having to show this message to you - we hope your debug logs are the key to solving the issue once and for all. If you'd like more information on the bug you've accidentally run into, please visit <a>the issue</a>.": "Riot has run into a problem which makes it difficult to show you your messages right now. Nothing has been lost and reloading the app should fix this for you. In order to assist us in troubleshooting the problem, we'd like to take a look at your debug logs. You do not need to send your logs unless you want to, but we would really appreciate it if you did. We'd also like to apologize for having to show this message to you - we hope your debug logs are the key to solving the issue once and for all. If you'd like more information on the bug you've accidentally run into, please visit <a>the issue</a>.",
-    "Send debug logs and reload Riot": "Send debug logs and reload Riot",
-    "Reload Riot without sending logs": "Reload Riot without sending logs",
     "You are currently blacklisting unverified devices; to send messages to these devices you must verify them.": "You are currently blacklisting unverified devices; to send messages to these devices you must verify them.",
     "We recommend you go through the verification process for each device to confirm they belong to their legitimate owner, but you can resend the message without verifying if you prefer.": "We recommend you go through the verification process for each device to confirm they belong to their legitimate owner, but you can resend the message without verifying if you prefer.",
     "Room contains unknown devices": "Room contains unknown devices",