Transfer rules_scala to bazel-contrib

[meteorcloudy]

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Description:

This issue proposes transferring the rules_scala repository from the bazelbuild GitHub organization to the bazel-contrib GitHub organization, which is owned by the Community for Bazel project under the Linux Foundation.

GitHub Discussion: https://github.com/orgs/bazelbuild/discussions/2

Impacts:

• GitHub issues & PRs will be transferred to the new repository.
• Branch protection rules will need to be transferred to the new repository.
• Individual maintainers will be transferred to the new repository.
• GitHub teams will NOT be transferred to the new repository and will need to be re-created.
• Bazel CI configurations will need to be updated to point to the new repository.

Read more on Transferring a repository from GitHub documentation.

Checklist:

• [x] Obtain approval from the current project maintainers (@liucijus, @simuons).
• [x] Obtain approval from the bazel-contrib SIG (@alexeagle).
• [ ] Initiate the transfer process on GitHub (@meteorcloudy).
• [ ] Update Bazel CI settings and confirm presubmit & postsubmit work (@meteorcloudy).