ensuring moz.build files have BUG_COMPONENTS for all files
in the testing/ subdirectory is a win. There are a lot of
older files and some files used in many harnesses. If the
files are primarily used for mochitest, they are associated
with the testing::mochitest component, otherwise I chose
the testing::general component.
There is an exception web-platform-tests, these have many
test files that need to be matched to proper components.
MozReview-Commit-ID: IIv9W2kEqeN
7e22dcbaa3