runner artifact rotation only works with user specified artifact directory

[cidrblock]

trafficstars

this is because a new directory is used every time based on /tmp/ansible-navigator-{uuid}

related to: https://github.com/ansible/ansible-navigator/pull/496

[cidrblock]

Related to #501

[ganeshrn]

Move the the runner artifact to path set by XDG_CACHE as a default (similar to collection doc cache) and remove {uuid} to allow for rotation to work properly.

[cidrblock]

or XDG_DATA_HOME since the files don't really need to be "cached" for use by navigator later:

https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

[webknjaz]

There is a single base directory relative to which user-specific state data should be written. This directory is defined by the environment variable $XDG_STATE_HOME.

The $XDG_STATE_HOME contains state data that should persist between (application) restarts, but that is not important or portable enough to the user that it should be stored in $XDG_DATA_HOME. It may contain:

• actions history (logs, history, recently used files, …)

• current state of the application that can be reused on a restart (view, layout, open files, undo history, …)

[cidrblock]

We need to be sure 2 instances of navigator don't collide after the navigator provided UUI in the path is gone