feat(workflow) improved workflows to be able to run workflows from a matrix and share workflows

[ArtieReus]

This PR contains:

• Run entire workflows as dependencies of a matrix. This way, you can sequentially trigger encapsulated jobs for each entity in a matrix.
• Share Juno workflows for other repositories. This allows us to use Juno workflows from Greenhouse as well and unify jobs such as checking third-party libraries, testing, and publishing.
• Test of packages in a encapsulated form
• Cancel testing if package has internal dependencies
• Check, test und publish from a package can be done independent of other packages failing