project: Always save built jar
project: Always save built jar

We now rely on drivers of bndlib such as Gradle, Maven and Bndtools
to determine when a project should be built. The Project class should
not attempt to second guess the drivers decision but declining to write
out the built files.

Fixes https://github.com/bndtools/bnd/issues/2664

Signed-off-by: BJ Hargrave <3d26bb3930946e3370762d769a073cece444c2d8@bjhargrave.com>

psoreide/bnd,psoreide/bnd,psoreide/bnd