MM-56201, MM-56280: Suppress typing and emoji events (#25794)

We do not send the typing event when the originating
channel is not the active channel or active channel thread.

https://mattermost.atlassian.net/browse/MM-56201

```release-note
NONE
```

Co-authored-by: harshil Sharma <harshilsharma63@gmail.com>
Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>

webapp/platform/types/src/config.ts

@@ -121,6 +121,7 @@ export type ClientConfig = {
     FileLevel: string;
     FeatureFlagAppsEnabled: string;
     FeatureFlagCallsEnabled: string;
+    FeatureFlagWebSocketEventScope: string;
     ForgotPasswordLink: string;
     GiphySdkKey: string;
     GoogleDeveloperKey: string;

webapp/platform/types/src/posts.ts

@@ -66,7 +66,7 @@ export type PostMetadata = {
     emojis: CustomEmoji[];
     files: FileInfo[];
     images: Record<string, PostImage>;
-    reactions: Reaction[];
+    reactions?: Reaction[];
     priority?: PostPriorityMetadata;
     acknowledgements?: PostAcknowledgement[];
 };