Team or Organizational-Level Notification Settings

### Problem Statement

Allow admins to manage notification preferences at the team or organizational level instead of relying on each user to configure notifications individually.

Use Case

Streamline notification management, particularly for large teams, by enabling admins to:

- Disable or adjust default notifications for all members of a team.
- Set default notification preferences that team members can optionally override.

Outcome

Simplified and consistent notification settings for teams, reducing manual effort and notification overload.

Impact:

- Prevents notification overload for large teams, allowing members to focus on relevant tasks without spending time on repetitive manual settings.
- Makes Sentry easier to manage for growing organizations with diverse teams and project setups.
- Provides a smoother onboarding process and better experience for team members by streamlining notifications.

Related:

https://github.com/getsentry/sentry/issues/81299

### Solution Brainstorm

_No response_

### Product Area

Settings