[MM-62491] Removing exported receivers.

[coltoneshaw]

Summary

Mattermost Calls does not need to have the receiver exported. This is disabling that export and securing the use of these to just the Mattermost app.

Ticket Link

https://mattermost.atlassian.net/browse/MM-62491

Checklist

• Added or updated unit tests (required for all new features)
• Has UI changes
• Includes text changes and localization file updates
• Have tested against the 5 core themes to ensure consistency between them.
• Have run E2E tests by adding label E2E iOS tests for PR.

Device Information

Has not been tested yet, pending an external pipeline where I can test this.

Release Note

[coltoneshaw]

Build does not like how this is exported. Need to see how to do this for older android versions since the vulnerability report suggested this but it's failing.

 > Task :voximplant_react-native-foreground-service:compileReleaseJavaWithJavac FAILED
/home/runner/work/mattermost-mobile/mattermost-mobile/node_modules/@voximplant/react-native-foreground-service/android/src/main/java/com/voximplant/foregroundservice/VIForegroundServiceModule.java:116: error: cannot find symbol
            getReactApplicationContext().registerReceiver(foregroundReceiver, filter, null, handler, ContextCompat.RECEIVER_NOT_EXPORTED);
                                                                                            ^
  symbol:   variable handler
  location: class VIForegroundServiceModule
/home/runner/work/mattermost-mobile/mattermost-mobile/node_modules/@voximplant/react-native-foreground-service/android/src/main/java/com/voximplant/foregroundservice/VIForegroundServiceModule.java:116: error: cannot find symbol
            getReactApplicationContext().registerReceiver(foregroundReceiver, filter, null, handler, ContextCompat.RECEIVER_NOT_EXPORTED);