pw_presubmit: Make the "quick" presubmit quick
pw_presubmit: Make the "quick" presubmit quick

The local presubmits have become quite slow. Everything they do is
repeated in CQ and CI, so reconfigure some steps. The intent is for the
local presubmit to fill the gap between pw watch and CI/CQ.

- Make gn_quick_build_check just a quick check of the state of the
  build. It runs gn check, but does not build any targets, since this is
  done repeatedly in pw watch by default.
- Skip bazel_test in local presubmits. Bazel can easily take two or
  three minutes to warm up, which is not worth the time investment when
  pushing. Bazel is tested in CQ before any code is submitted.

Change-Id: Ic1453d1345df0c2f2a300293c8d9e66734ad0917
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/57781
Reviewed-by: Keir Mierle <69344103cc60b36d6e1fbdc31ce6504b2286c646@google.com>
Reviewed-by: Rob Mohr <d07614a8a0b466db08f68224f87d738b0f9615cf@google.com>
Commit-Queue: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Pigweed-Auto-Submit: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>

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