Fix `Ci::Pipeline#environments` not working for bridge jobs

This MR is on top of Refactor `Deployment` compatible with `Ci::Buil... (!128192 - merged).

What does this MR do and why?

Ci::Pipeline#environments_in_self_and_project_descendants method is used for fetching related environments for a particular pipeline. This fetches the relationship via build jobs currently, however, it should also include bridge jobs in order for Support `environment` keyword with `trigger` ke... (#369061 - closed).

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