Export deployment data to calling workflow

[ppkarwasz]

This adds two outputs to both the deploy-release-reusable and deploy-snapshot-reusable workflows:

• project-version: contains the version of the deployed project.
• nexus-url: contains the URL of the Nexus repository, where the artifacts were deployed.

This PR is based on the GitHub Using outputs from a reusable workflow documentation.

[It also fixes a small YAML syntax error, ignored by GitHub, but reported by IDEA]