Add rules_scala to the Jenkins configuration
Add rules_scala to the Jenkins configuration

Scala rules have been moved to their own project, test them independently.

Change-Id: I89c78a8f7e8c9e0e68b45c59573c5832d5d9700d

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration