… 1.116.0 and later

…nder different name from default JAR

This is to ensure compatibility with old UI5 Tooling versions that are
used in parallel. An old version might download the default JAR for
1.117.0-SNAPSHOT and store it under "<library name>-prebuilt".

While a new UI5 Tooling version would expect the content of the
npm-dist.zip artifact under that name.

Therefore, we use a new name for storing the new artifact.

with installed content from previous ui5-project versions.

The prebuilt package previously didn't contain a package.json.
Now we only consider a package to be installed when it has a package.json
This causes old jar based packages that already exist to be removed and
replaced by the new npm-dist.zip contents.