Stop building the gitiles plugin on the master branch

The gitiles plugin is now a core plugin, so we don't need
a separate build.

Feature: Issue 10334
Change-Id: Ie40059d807ac6b2870f5fbf5a84594b62de7bf6d
1 file changed
tree: 42132704467ce2e2ed43992650733e1a719ae4f5
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore