Organize Mojo and Mandoline GN meta targets.

Distribute explicit component data_deps among targets.
Add related test targets to mandoline:tests and mojo:tests.
Remove redundant main waterfall and CQ build targets.

Add mojo/services/test_service meta-target, add to parent.
Rename vm and resource_provider unittests.
Nix obsolete valgrind exception.

BUG=416621
TEST=Building 'mandoline' builds everything needed to run mandoline (no tests). Building mandoline:tests builds all related tests.
R=sky@chromium.org
TBR=ben@chromium.org

Review URL: https://codereview.chromium.org/1113223002

Cr-Commit-Position: refs/heads/master@{#328619}

• BUILD.gn[diff]
• components/core_services/BUILD.gn[diff]
• components/html_viewer/BUILD.gn[diff]
• components/resource_provider/BUILD.gn[diff]
• components/view_manager/BUILD.gn[diff]
• components/window_manager/BUILD.gn[diff]
• mandoline/BUILD.gn[diff]
• mandoline/app/BUILD.gn[diff]
• mandoline/ui/aura/BUILD.gn[diff]
• mojo/BUILD.gn[diff]
• mojo/runner/BUILD.gn[diff]
• mojo/services/BUILD.gn[diff]
• mojo/services/test_service/BUILD.gn[diff]
• testing/buildbot/chromium.linux.json[diff]
• testing/buildbot/tryserver.chromium.linux.json[diff]
• tools/valgrind/gtest_exclude/mojo_view_manager_unittests.gtest-drmemory.txt[Deleted - diff]