Duplicate task configs to test all supported Bazel LTS releases (#1858)

For each task, if bazel version is not specified, duplicate the task for
each supported Bazel LTS releases.

Users can override the bazel version in the presubmit.yml file
explicitly to bypass this duplication.

Relevant discussion and changes:
- https://github.com/bazelbuild/bazel-central-registry/discussions/1332
- https://github.com/bazelbuild/bazel-central-registry/pull/1373
- https://github.com/bazel-contrib/rules-template/pull/105
1 file changed