Build/Test tools: Reinstate fast finishing on Travis CI.

This allows for speedier feedback for breaking changes and ongoing failures.

See #46634


git-svn-id: https://develop.svn.wordpress.org/trunk@45004 602fd350-edb4-49c9-b593-d223f7449a82

.travis.yml

@@ -42,6 +42,7 @@ matrix:
     dist: precise
   - php: 7.4snapshot
   - php: nightly
+  fast_finish: true
 before_install:
 - |
   if [[ "$WP_TRAVISCI" == "travis:phpunit" ]]; then