Transfer rules_jsonnet to bazel-contrib

[meteorcloudy]

Description:

This issue proposes transferring the rules_jsonnet 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 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 (@EdSchouten, @sparkprime, @Globegitter).
• [x] Obtain approval from the bazel-contrib SIG (@alexeagle).
• [x] Initiate the transfer process on GitHub (@meteorcloudy).
• [x] Update Bazel CI settings and confirm presubmit & postsubmit work (@meteorcloudy).

[EdSchouten]

Approved!

[alexeagle]

Notes from SIG meeting: this transfer was unanimously approved by a thumbs-up vote.

[meteorcloudy]

Thanks for the approvals, I'll initiate the transfer now.

[meteorcloudy]

Done, presubmit verified at https://github.com/bazel-contrib/rules_jsonnet/pull/201

Let me know if there is any issues.