Change the default Custom Search organisation wide

### Problem Statement The default filter in Sentry is now `is:unresolved issue.priority:[high, medium]`. We would like default to be `is:unresolved`, as we aim for inbox zero across our organisation's issues. You support colleagues suggested it was not possible to change the default filter for everyone in an organisation, and suggested we open an issue. ### Solution Brainstorm _No response_ ### Product Area Issues