Change default status filter from New to a user-defined value in the app-config.yaml

### Describe the feature

Our default status is **Open**; we do not have a **New** value.

I was able to get the plugin working by annotating our catalog-info.yaml files with something like this:

` jira.com/incoming-issues-status: Open`

We will have to apply this to every single catalog entry.

I would like to be able to add this to the app-config.yaml once. I can't seem to find a way to do this.

### Added value

This would allow the Jira plugin to adapt to different implementations of Jira

### Additional context

Not much to add, if this is already possible, I would gladly add to a pull request for documentation update to this README: https://github.com/AxisCommunications/backstage-plugins/blob/main/plugins/jira-dashboard/README.md