[infra] Do not generate output_links for swarmed android tests.

For android tests that are swarmed, the swarming dict has an
output_links entry generated. This entry isn't read by the recipe's
generator, so serves no purpose.

Change-Id: I00b208d41e215587310f59dd8aff727ca43f64f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5420785
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@google.com>
Cr-Commit-Position: refs/heads/main@{#1282177}