[JENKINS-36707] Add `CI` environment variable
Introduces a standard `CI` env var that is always set to "true" in order to allow pipelines and tools to know they're executing in a continuous integration context. This has emerged as a best practice used by most other popular CI solutions, and a number of tools look for this variable in order to make CI-appropriate optimizations (cf. the ticket). Closes JENKINS-36707.
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