[PBE-0] fix android notification buttons being unresponsive

[kanat]

🎯 Goal

Since we use RECEIVER_NOT_EXPORTED flag while registering the BroadcastReceiver, we also have to set packageName to Intent itself to let OS know that actions are being sent internally in the app.

☑️Contributor Checklist

General

• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#flutter-team) (required)
• PR is linked to the GitHub issue it resolves

☑️Reviewer Checklist

• Sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• All code we touched has new or updated Documentation

[Brazol]

LGTM