Delete .github, .gitmodules and BUILD files Those files are causing noise and fails the linter, .gitmodules would trigger sub-git repository linters and BUILD files are still recognized by AOSP (roboleaf). See https://android-review.git.corp.google.com/c/platform/external/cronet/+/3278451/1 for the approved CL Change-Id: I9371212d5ba74a311962d97fbec9eb595447a90c