Enforce no SNAPSHOT dependencies

As we are targetting a release each day, we want to enforce that there are no SNAPSHOT dependencies, even the actual nuxeo-connect-client and nuxeo-ftest.

Run and configure 2 executions of the maven-enforcer-plugin to:

• check all dependencies excluding Nuxeo ones (because we are building and using 11.1-SNAPSHOT modules)
• check only specific Nuxeo dependencies, such as nuxeo-connect-client and nuxeo-ftest that were excluded in the first execution.

Remove the unneeded exclusions of the nightly profile as it won't be needed.