Depends on pipeline

[twometresteve]

Goal

For each of the Buildkite pipelines, use the depends_on feature to form a dependency tree of build steps instead of running in a series of parallel steps. This avoids steps needlessly waiting for steps in previous groups to complete if their dependency steps have already completed, potentially saving elapsed time on the overall build. Indications are a time saving of 25% for React Native.

Design

Pipeline step key and depends_on used as documented by Buildkite.

Changeset

Pipelines ordering and utilization of step dependency mechanism only.

Testing

Covered by standard CI.

[bugsnagbot]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	40.57 kB	12.52 kB
After	40.57 kB	12.52 kB
±	No change	No change

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