* Remove `travis:` tasks in Gruntfile.js.
* Remove status badge in README.md that comes from Travis CI via shields.io.
* Remove Travis CI related skipping in the `WP_UnitTestCase_Base::skipOnAutomatedBranches()` test method and related Docker environment variables.
Props johnbillion, SergeyBiryukov, ocean90.
See #52161.
Fixes#52666.
git-svn-id: https://develop.svn.wordpress.org/trunk@50697 602fd350-edb4-49c9-b593-d223f7449a82