Improve bash test target log by:
Improve bash test target log by:

* Adding a timestamp above when a test is run so logs are easier to chase down
* Insert new line after test log output to avoid cases where the test output doesn't add one.

PiperOrigin-RevId: 316561771

cushon/bazel,werkt/bazel,ButterflyNetwork/bazel,davidzchen/bazel,meteorcloudy/bazel,perezd/bazel,ButterflyNetwork/bazel,cushon/bazel,ulfjack/bazel,safarmer/bazel,perezd/bazel,ButterflyNetwork/bazel,cushon/bazel,ButterflyNetwork/bazel,meteorcloudy/bazel,meteorcloudy/bazel,ulfjack/bazel,twitter-forks/bazel,ulfjack/bazel,ulfjack/bazel,davidzchen/bazel,bazelbuild/bazel,katre/bazel,meteorcloudy/bazel,bazelbuild/bazel,twitter-forks/bazel,werkt/bazel,perezd/bazel,cushon/bazel,bazelbuild/bazel,cushon/bazel,katre/bazel,werkt/bazel,ulfjack/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,twitter-forks/bazel,safarmer/bazel,davidzchen/bazel,safarmer/bazel,perezd/bazel,meteorcloudy/bazel,katre/bazel,werkt/bazel,meteorcloudy/bazel,cushon/bazel,davidzchen/bazel,twitter-forks/bazel,twitter-forks/bazel,katre/bazel,davidzchen/bazel,werkt/bazel,perezd/bazel,werkt/bazel,ButterflyNetwork/bazel,ulfjack/bazel,katre/bazel,davidzchen/bazel,davidzchen/bazel,twitter-forks/bazel,perezd/bazel,ulfjack/bazel,safarmer/bazel,safarmer/bazel,bazelbuild/bazel,safarmer/bazel,perezd/bazel,katre/bazel,twitter-forks/bazel,bazelbuild/bazel,meteorcloudy/bazel