Also add two targets to make it more convienent to tail & dump the sauce service logs: //tools/saucelabs:sauce_service_tail & //tools/saucelabs:sauce_service_log
PR Close#36109
* Added a /tools/saucelabs/sauce-service.sh script that manages the sauce-connect as a service which is used by the karma-saucelabs.js wrapper to start the service.
* Added /tools/saucelabs/README.md that covers the details of SauceLabs karma testing with Bazel.
PR Close#34769