allow to hide some java packages from projects view

### Description

in our company we use a system of project templates that create some packages present in every project. while I want/need them on classpath (thus can't mostly delete them), I would like to hide them from view. In the screenshot below everything that start with `au.com.foxtel.bedrock`

### Use case/motivation

hiding such packages would clear up the view and allow me to orient myself better in codebases.

### Related issues

_No response_

### Are you willing to submit a pull request?

No

No file or test is named in the issue. Start by locating the NetBeans Projects view implementation and tracing how Java packages are presented; done means packages matching a user-selected pattern remain on the classpath but are hidden from that view, with coverage for the requested prefix behavior.

Written by the indexing model from the issue text.