d363fdc31b
This splits the web engine into a build phase and a test phase. This requires a few changes: * Modify the `generate_builder_json.dart` command to produce two separate json builder files, `linux_web_engine_build.json` and `linux_web_engine_test.json`. The former is left as the existing builder with `release_build: true` (which will run in the merge queue) and the latter is added as a new builder that runs in the second CI phase. * Change the `copy_artifacts_step.dart` to pull built artifacts from the GCS bucket when on LUCI, instead of relying on the CAS bucket. This is necessary to do the tests separately from the build. * Move the `felt test --copy-artifacts` command from the build steps to the test steps, since the test steps themselves need to pull from GCS instead of relying on the artifacts being populated by CAS.
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