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Draft: Use persisted downstream project in Ci::BridgePolicy

Hordur Freyr Yngvason requested to merge use-persisted-project-in-bridge-policy into master

What does this MR do and why?

Ci::Bridge#downstream_project reads from the build options and expands variables. This can be very expensive when rendering a many multi-project bridge jobs.

But if the bridge has been persisted, then the associated downstream pipeline should also have the project, and we should be able to use that instead.

See https://gitlab.com/gitlab-org/gitlab/-/pipelines/1156524794/stage.json?stage=test&performance_bar=flamegraph&stackprof_mode=wall for an example.

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Edited by Hordur Freyr Yngvason

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