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We no longer have separate test-type-handling logic for CTS tests
and instrumentation tests; instead, they emulate and are treated
as gtest-based tests by the infrastructure these days.

This CL updates the //testing/buildbot/README.md documentation
and the generator code accordingly.

Bug: 816629
Change-Id: I56d646cab293dcd9e59209d80d6fa016fd1d5ffd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303773
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789268}