Ability to skip certain file types when using the keyboard shortcuts

[bobsilverberg]

This is based on feedback from the meeting we had today to discuss the code manager.

There was a desire expressed to be able to configure the file tree to skip particular files when navigating via keyboard shortcuts. Examples of files to be skipped include cose/sig, images, DS_Store, etc. It wasn't clear whether this would be a global setting in code-manager, so that all users would have the same files skipped over, or if it would be configurable for a single user. Also, whether this would be something than can be manually turned on and off was not discussed.

More discussion about this feature is needed.

┆Issue is synchronized with this Jira Task

[bobsilverberg]

It's possible that any file could contain malicious code and be loaded in the browser, so this could be dangerous right now. There is a discussion in a related bug that currently blocks this. https://bugzilla.mozilla.org/show_bug.cgi?id=1588801